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Walter N, Doppelbauer M, Schaller S, Liu X, Thomas R, Wright S, Sartakov BG, Meijer G. Triplet Rydberg States of Aluminum Monofluoride. J Phys Chem A 2024; 128:2752-2762. [PMID: 38551124 PMCID: PMC11017311 DOI: 10.1021/acs.jpca.4c00611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/04/2024] [Accepted: 03/06/2024] [Indexed: 04/12/2024]
Abstract
Aluminum monofluoride (AlF) is a suitable molecule for laser cooling and trapping. Such experiments require extensive spectroscopic characterization of the electronic structure. Two of the theoretically predicted higher-lying triplet states of AlF, the counterparts of the well-characterized D1Δ and E1Π states, had not been experimentally identified yet. We here report on the characterization of the d3Π (v = 0-6) and e3Δ (v = 0-2) states, confirming the predicted energetic ordering of these states (J. Chem. Phys. 1988, 88, 5715-5725), as well as of the f3Σ+ (v = 0-2) state. The transition intensity of the d3Π, v = 3 - a3Π, v = 3 band is negligibly small. This band gets its weak, unexpected rotational structure via intensity borrowing from the nearby e3Δ, v = 2 - a3Π, v = 3 band, made possible via spin-orbit and spin-rotation interaction between the d3Π and e3Δ states. This interaction affects the equilibrium rotational constants in both states; their deperturbed values yield equilibrium internuclear distances that are consistent with the observations. We determined the ionization potential of AlF to be 78,492(1) cm-1 by ionization from the d3Π state.
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Affiliation(s)
- N. Walter
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - M. Doppelbauer
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - S. Schaller
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - X. Liu
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - R. Thomas
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - S. Wright
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - B. G. Sartakov
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - G. Meijer
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
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Walter N, Seifert J, Truppe S, Schewe HC, Sartakov BG, Meijer G. Spectroscopic characterization of singlet–triplet doorway states of aluminum monofluoride. J Chem Phys 2022; 156:184301. [DOI: 10.1063/5.0088288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Aluminum monofluoride (AlF) possesses highly favorable properties for laser cooling, both via the A1Π and a3Π states. Determining efficient pathways between the singlet and the triplet manifold of electronic states will be advantageous for future experiments at ultralow temperatures. The lowest rotational levels of the A1Π, v = 6 and b3Σ+, v = 5 states of AlF are nearly iso-energetic and interact via spin–orbit coupling. These levels thus have a strongly mixed spin-character and provide a singlet–triplet doorway. We here present a hyperfine resolved spectroscopic study of the A1Π, v = 6//b3Σ+, v = 5 perturbed system in a jet-cooled, pulsed molecular beam. From a fit to the observed energies of the hyperfine levels, the fine and hyperfine structure parameters of the coupled states and their relative energies as well as the spin–orbit interaction parameter are determined. The standard deviation of the fit is about 15 MHz. We experimentally determine the radiative lifetimes of selected hyperfine levels by time-delayed ionization, Lamb dip spectroscopy, and accurate measurements of the transition lineshapes. The measured lifetimes range between 2 and 200 ns, determined by the degree of singlet–triplet mixing for each level.
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Affiliation(s)
- N. Walter
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - J. Seifert
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - S. Truppe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - H. C. Schewe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - B. G. Sartakov
- Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilovstreet 38, 119991 Moscow, Russia
| | - G. Meijer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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van Goor I, Nagelhout A, Besselink M, Bonsing B, Bosscha K, Brosens L, Busch O, Cirkel G, van Dam R, Festen S, Groot Koerkamp B, van der Harst E, de Hingh I, Kazemier G, Meijer G, de Meijer V, Nieuwenhuijs V, Roos D, Schreinemakers J, Stommel M, Verdonk R, van Santvoort H, Molenaar Q, Daamen L, Intven M. OC-0111 Prognostic factors for isolated local recurrence after resection of pancreatic ductal adenocarcinoma. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02487-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Grimbergen G, Eijkelenkamp H, Heerkens H, Raaymakers B, Intven M, Meijer G. MO-0467 Dosimetric impact of intrafraction upper abdominal tumor motion during MR-guided SBRT. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02361-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Eijkelenkamp H, Grimbergen G, Heerkens H, Meijer G, Daamen L, Molenaar Q, van Santvoort H, Erickson B, Hall W, Intven M. MO-0221 Short-term toxicity outcomes after MR-guided SBRT for (peri-)pancreatic tumors on a 1.5T MR-linac. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02323-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Doppelbauer M, Wright SC, Hofsäss S, Sartakov BG, Meijer G, Truppe S. Hyperfine-resolved optical spectroscopy of the A 2Π ← X 2Σ + transition in MgF. J Chem Phys 2022; 156:134301. [DOI: 10.1063/5.0081902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We report on hyperfine-resolved laser spectroscopy of the A2Π ← X2Σ+ transition of magnesium monofluoride (MgF), relevant for laser cooling. We recorded 25 rotational transitions with an absolute accuracy of better than 20 MHz, assigned 56 hyperfine lines, and determined precise rotational, fine, and hyperfine structure parameters for the A2Π state. The radiative lifetime of the A2Π state was determined to be 7.2(3) ns, in good agreement with ab initio calculations. The transition isotope shift between bosonic isotopologues of the molecule is recorded and compared to predicted values within the Born–Oppenheimer approximation. We measured the Stark effect of selected rotational lines of the A2Π ← X2Σ+ transition by applying electric fields of up to 10.6 kV cm−1 and determined the permanent electric dipole moments of 24MgF in its ground X2Σ+ and first excited A2Π states to be μ X = 2.88(20) D and μ A = 3.20(22) D, respectively. Based on these measurements, we caution for potential losses from the optical cycling transition due to electric field induced parity mixing in the excited state. In order to scatter 104 photons, the electric field must be controlled to below 1 V cm−1.
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Affiliation(s)
- M. Doppelbauer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - S. C. Wright
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - S. Hofsäss
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - B. G. Sartakov
- General Physics Institute, Russian Academy of Sciences, Vavilovstreet 38, 119991 Moscow, Russia
| | - G. Meijer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - S. Truppe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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Walter N, Doppelbauer M, Marx S, Seifert J, Liu X, Pérez-Ríos J, Sartakov BG, Truppe S, Meijer G. Spectroscopic characterization of the a 3Π state of aluminum monofluoride. J Chem Phys 2022; 156:124306. [DOI: 10.1063/5.0082601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Spectroscopic studies of aluminum monofluoride (AlF) have revealed its highly favorable properties for direct laser cooling. All Q lines of the strong A1Π ← X1Σ+ transition around 227 nm are rotationally closed and thereby suitable for the main cooling cycle. The same holds for the narrow, spin-forbidden a3Π ← X1Σ+ transition around 367 nm, which has a recoil limit in the µK range. We here report on the spectroscopic characterization of the lowest rotational levels in the a3Π state of AlF for v = 0–8 using a jet-cooled, pulsed molecular beam. An accidental AC Stark shift is observed on the a3Π0, v = 4 ← X1Σ+, v = 4 band. By using time-delayed ionization for state-selective detection of the molecules in the metastable a3Π state at different points along the molecular beam, the radiative lifetime of the a3Π1, v = 0, J = 1 level is experimentally determined as τ = 1.89 ± 0.15 ms. A laser/radio frequency multiple resonance ionization scheme is employed to determine the hyperfine splittings in the a3Π1, v = 5 level. The experimentally derived hyperfine parameters are compared to the outcome of quantum chemistry calculations. A spectral line with a width of 1.27 kHz is recorded between hyperfine levels in the a3Π, v = 0 state. These measurements benchmark the electronic potential of the a3Π state and yield accurate values for the photon scattering rate and for the elements of the Franck–Condon matrix of the a3Π–X1Σ+ system.
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Affiliation(s)
- N. Walter
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - M. Doppelbauer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - S. Marx
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - J. Seifert
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - X. Liu
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - J. Pérez-Ríos
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - B. G. Sartakov
- Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilovstreet 38, 119991 Moscow, Russia
| | - S. Truppe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - G. Meijer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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Grimbergen G, Eijkelenkamp H, Heerkens H, Raaymakers B, Intven M, Meijer G. PD-0861 Intrafraction pancreatic tumor motion patterns during ungated MR-guided SBRT with abdominal corset. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07140-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Eijkelenkamp H, Boekhoff M, Verweij M, Peters F, Meijer G, Intven M. OC-0624 PTV margin assessment for an online adaptive MR-guided dose-escalation strategy in rectal cancer. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06980-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Daamen L, de Mol van Otterloo S, van Goor I, Eijkelenkamp H, Erickson B, Hall W, Heerkens H, Meijer G, Molenaar Q, van Santvoort H, Verkooijen L, Intven M. PO-1218 Online adaptive MR-guided SBRT for unresectable upper abdominal malignancies using a 1.5T MR-linac. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07669-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Deferm JT, Nijsink J, Baan F, Verhamme L, Meijer G, Maal T. Soft tissue-based registration of intraoral scan with cone beam computed tomography scan. Int J Oral Maxillofac Surg 2021; 51:263-268. [PMID: 33933335 DOI: 10.1016/j.ijom.2021.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 01/28/2021] [Accepted: 04/06/2021] [Indexed: 10/21/2022]
Abstract
The aim of this study was to evaluate a novel soft tissue-based method to register an intraoral scan (IOS) with a cone beam computed tomography (CBCT) scan. IOS and CBCT data were obtained from eight dentate patients (mean age 21±2 years; three male, five female) and 14 fully edentulous patients (mean age 56±9 years; eight male, six female). An algorithm was developed to create a soft tissue model of the CBCT scan, which allowed a soft tissue-based registration to be performed with the IOS. First, validation was performed on dentate jaws with registration of the palatal mucosal surface and accuracy evaluation at the level of the teeth. Second, fully edentulous jaws were registered using both the palatal and alveolar crest mucosal surfaces. Distance maps were created to measure the method accuracy. The mean registration error was 0.49±0.26mm for the dentate jaws. Registration of the fully edentulous jaws had a mean error of 0.16±0.08mm at the palate and 0.16±0.05mm at the alveolar crest. In conclusion, the high accuracy of this registration method may allow the digital workflow to be optimized when no teeth are available to perform a regular registration procedure.
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Affiliation(s)
- J T Deferm
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands.
| | - J Nijsink
- 3D Laboratory, Department of Radiology ad Nuclear Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - F Baan
- 3D Laboratory, Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - L Verhamme
- 3D Laboratory, Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - G Meijer
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands; Department of Implantology and Periodontology, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - T Maal
- 3D Laboratory, Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
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Boekhoff M, Defize I, Kotte A, Takahashi N, Lagendijk J, Mook S, Meijer G. PD-0554: CTV-to-PTV margin assessment for esophageal cancer radiotherapy based on accumulated dose analysis. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00576-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Defize I, Boekhoff M, Borggreve A, Van Lier A, Takahashi N, Haj Mohommad N, Ruurda J, Van Hillegersberg R, Mook S, Meijer G. PO-1679: Tumor volume regression during neoadjuvant chemoradiotherapy for esophageal cancer on weekly MRI. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01697-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Doppelbauer M, Walter N, Hofsäss S, Marx S, Schewe HC, Kray S, Pérez-Ríos J, Sartakov BG, Truppe S, Meijer G. Characterisation of the b3Σ+, v = 0 state and its interaction with the A1Π state in aluminium monofluoride. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1810351] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M. Doppelbauer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - N. Walter
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - S. Hofsäss
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - S. Marx
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - H. C. Schewe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - S. Kray
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - J. Pérez-Ríos
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - B. G. Sartakov
- General Physics Institute, Russian Academy of Sciences, Moscow, Russia
| | - S. Truppe
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
| | - G. Meijer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
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Schraa S, Van Rooijen K, Kruijssen D, Alarcón CR, Phallen J, Sausen M, Simmons J, Coupe V, Van Grevenstein H, Elias S, Verkooijen H, Bosch L, Van Den Broek D, Meijer G, Velculescu V, Fijneman R, Vink G, Koopman M. 521TiP Circulating tumor DNA guided adjuvant chemotherapy in stage II colon cancer according the trials within cohorts design: The MEDOCC-CrEATE trial. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Monkhorst K, Samsom K, Schipper L, Roepman P, Bosch L, de Bruijn E, Hoes L, Riethorst I, Schoenmaker L, van der Kolk L, Buffart T, van der Hoeven K, Voest E, Cuppen E, Meijer G. 1189O Validation of whole genome sequencing in routine clinical practice. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Deferm JT, Baan F, Schreurs R, Willaert R, Maal T, Meijer G. Digital surface scanning in flap perfusion. Int J Oral Maxillofac Surg 2020; 50:38-42. [PMID: 32593512 DOI: 10.1016/j.ijom.2020.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 04/05/2020] [Accepted: 05/21/2020] [Indexed: 10/24/2022]
Abstract
Monitoring vascular perfusion of transferred tissue is essential in reconstructive surgery to recognize early flap failure. The aim of this study was to evaluate the ability of a digital surface scanner to detect vascular perfusion disorders through the monitoring of skin colour changes. A total of 160 surface scans of the forearm skin were performed with a TRIOS 3D scanner. Vascular compromise was simulated at different time-points by intermittent occlusion of the blood supply to the forearm skin (first the arterial blood supply and then the venous blood supply). Skin colour changes were examined according to the hue, saturation, and value colour scale. Colour differences were analysed with a paired t-test. Significant differences were observed between the colour of the normal skin and that of the vascular compromised skin (P<0.01). The surface scanner could distinguish between arterial occlusion and venous congestion (P<0.01). A digital surface scan is an objective, non-invasive tool to detect early vascular perfusion disorders of the skin.
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Affiliation(s)
- J T Deferm
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
| | - F Baan
- Department of Orthodontics and Craniofacial Biology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Radboudumc 3D Lab, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - R Schreurs
- Radboudumc 3D Lab, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Department of Oral and Maxillofacial Surgery, Amsterdam UMC Location AMC and Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam, Amsterdam, The Netherlands
| | - R Willaert
- Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Head and Neck Surgery, Ghent University Hospital, Ghent, Belgium
| | - T Maal
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Radboudumc 3D Lab, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - G Meijer
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Department of Implantology and Periodontology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Toes-Zoutendijk E, Kooyker AI, Dekker E, Spaander MCW, Opstal-van Winden AWJ, Ramakers C, Buskermolen M, van Vuuren AJ, Kuipers EJ, van Kemenade FJ, Velthuysen MLF, Thomeer MGJ, van Veldhuizen H, van Ballegooijen M, Nagtegaal ID, de Koning HJ, van Leerdam ME, Lansdorp-Vogelaar I, Otte J, Wiersma T, Masclee A, van Bergeijk J, Meijer G, de Graaf E, van Grevenstein W, Frasa M, Jacobs L, Stoker J, Vink G, Elferink M. Incidence of Interval Colorectal Cancer After Negative Results From First-Round Fecal Immunochemical Screening Tests, by Cutoff Value and Participant Sex and Age. Clin Gastroenterol Hepatol 2020; 18:1493-1500. [PMID: 31442598 DOI: 10.1016/j.cgh.2019.08.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 07/31/2019] [Accepted: 08/09/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS We evaluated the incidence of interval cancers between the first and second rounds of colorectal cancer (CRC) screening with the FOB-Gold fecal immunochemical test (FIT), and the effects of different cutoff values and patient sex and age. METHODS We collected data from participants in a population-based CRC screening program in the Netherlands who had a negative result from a first-round of FIT screening. We calculated the cumulative incidence of interval cancer after a negative result from a FIT and the sensitivity of the FIT for detection of CRC at a low (15 μg Hb/g feces) and high (47 μg Hb/g feces) cutoff value. RESULTS Among the 485,112 participants with a negative result from a FIT, 544 interval cancers were detected; 126 were in the 111,800 participants with negative results from a FIT with the low cutoff value and 418 were in the 373,312 FIT participants with negative results from a FIT with the high cutoff value. The mean age of participants tested with the low cutoff value was 72.0 years and the mean age of participants tested the high cutoff value was 66.7 years. The age-adjusted 2-year cumulative incidence of interval cancer after a negative result from a FIT were 9.5 per 10,000 persons at the low cutoff value vs 13.8 per 10,000 persons at the high cutoff value (P < .005). The age-adjusted sensitivity of the FIT for CRC were 90.5% for the low cutoff value vs 82.9% for the high cutoff (P < .0001). The FIT identified men with CRC with 87.4% sensitivity and women with CRC with 82.6% sensitivity (P < .001). CONCLUSIONS In an analysis of data from a FIT population-based screening program in the Netherlands, we found that incidence of interval CRC after a negative result from a FIT to be low. Although the sensitivity of detection of CRC decreased with a higher FIT cutoff value, it remained above 80%.
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Affiliation(s)
- Esther Toes-Zoutendijk
- Department of Public Health, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands.
| | - Arthur I Kooyker
- Department of Public Health, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands; Department of Gastroenterology and Hepatology, Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands; Department of Gastroenterology and Hepatology, Leiden University Medical Center, Leiden, the Netherlands
| | - Evelien Dekker
- Department of Gastroenterology and Hepatology, Academic Medical Center, Academic University Medical Centers, Amsterdam, the Netherlands
| | - Manon C W Spaander
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | | | - Christian Ramakers
- Department of Clinical Chemistry, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - Maaike Buskermolen
- Department of Public Health, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - Anneke J van Vuuren
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - Ernst J Kuipers
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - Folkert J van Kemenade
- Department of Pathology, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | | | - Maarten G J Thomeer
- Department of Radiology, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - Harriët van Veldhuizen
- Department of Quality Improvement, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | | | - Iris D Nagtegaal
- Department of Pathology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Harry J de Koning
- Department of Public Health, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
| | - Monique E van Leerdam
- Department of Gastroenterology and Hepatology, Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands; Department of Gastroenterology and Hepatology, Leiden University Medical Center, Leiden, the Netherlands
| | - Iris Lansdorp-Vogelaar
- Department of Public Health, Erasmus MC University Medical Center Rotterdam, Rotterdam, the Netherlands
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Van Doorne L, De Kock L, De Moor A, Shtino R, Bronkhorst E, Meijer G, De Bruyn H. Flaplessly placed 2.4-mm mini-implants for maxillary overdentures: a prospective multicentre clinical cohort study. Int J Oral Maxillofac Surg 2020; 49:384-391. [DOI: 10.1016/j.ijom.2019.08.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/31/2019] [Accepted: 08/21/2019] [Indexed: 11/26/2022]
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Roepman P, Bosch L, Samsom K, Schipper L, de Bruijn E, Hoes L, Riethorst I, Schoenmaker L, van der Kolk L, van Snellenberg H, Voest E, Cuppen E, Monkhorst K, Meijer G. WGS implementation in standard cancer diagnostics for every cancer patient (WIDE). Ann Oncol 2019. [DOI: 10.1093/annonc/mdz257.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Van Herk M, Burnet N, Dinapoli N, Meijer G, Nestlé U, Van den Bongard D, Stock M. EP-1854 Application of a tool for bulk treatment plan evaluation in advanced treatment planning training. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)32274-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Boekhoff M, Mook S, Borggreve A, Goense L, Van Rossum P, Takahashi N, Van Lier A, Kotte A, Lagendijk J, Meijer G. OC-0083 MRI guided set-up corrections for esophageal cancer: what margin do we need? Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30503-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Boekhoff M, Kotte A, Mook S, Borggreve A, Goense L, Heethuis S, Van Rossum P, Van Lier A, Lagendijk J, Meijer G. PO-0951: What CTV-to-PTV margins are required for esophageal cancer radiotherapy? Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31261-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Van den Berg N, Maspero M, Dinkla A, Savenije M, Meijer G, Seevinck P, Lagendijk J, Raaymakers B. SP-0659: MRI techniques for MR-only simulation. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30969-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Soehardi A, Meijer G, Stoelinga P. An inventory of mandibular fractures associated in atrophic edentulous mandibles. Int J Oral Maxillofac Surg 2017. [DOI: 10.1016/j.ijom.2017.02.358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Vink G, Coebergh van den Braak R, Punt C, Verkooijen H, De Noo M, Meijer G, Koopman M. The Prospective Dutch ColoRectal Cancer cohort (PLCRC) − a prospective nationwide observational cohort study. Eur J Cancer 2017. [DOI: 10.1016/s0959-8049(17)30259-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Borstlap WAA, Tanis PJ, Koedam TWA, Marijnen CAM, Cunningham C, Dekker E, van Leerdam ME, Meijer G, van Grieken N, Nagtegaal ID, Punt CJA, Dijkgraaf MGW, De Wilt JH, Beets G, de Graaf EJ, van Geloven AAW, Gerhards MF, van Westreenen HL, van de Ven AWH, van Duijvendijk P, de Hingh IHJT, Leijtens JWA, Sietses C, Spillenaar-Bilgen EJ, Vuylsteke RJCLM, Hoff C, Burger JWA, van Grevenstein WMU, Pronk A, Bosker RJI, Prins H, Smits AB, Bruin S, Zimmerman DD, Stassen LPS, Dunker MS, Westerterp M, Coene PP, Stoot J, Bemelman WA, Tuynman JB. A multi-centred randomised trial of radical surgery versus adjuvant chemoradiotherapy after local excision for early rectal cancer. BMC Cancer 2016; 16:513. [PMID: 27439975 PMCID: PMC4955121 DOI: 10.1186/s12885-016-2557-x] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 07/13/2016] [Indexed: 12/13/2022] Open
Abstract
Background Rectal cancer surgery is accompanied with high morbidity and poor long term functional outcome. Screening programs have shown a shift towards more early staged cancers. Patients with early rectal cancer can potentially benefit significantly from rectal preserving therapy. For the earliest stage cancers, local excision is sufficient when the risk of lymph node disease and subsequent recurrence is below 5 %. However, the majority of early cancers are associated with an intermediate risk of lymph node involvement (5–20 %) suggesting that local excision alone is not sufficient, while completion radical surgery, which is currently standard of care, could be a substantial overtreatment for this group of patients. Methods/Study design In this multicentre randomised trial, patients with an intermediate risk T1-2 rectal cancer, that has been locally excised using an endoluminal technique, will be randomized between adjuvant chemo-radiotherapylimited to the mesorectum and standard completion total mesorectal excision (TME). To strictly monitor the risk of locoregional recurrence in the experimental arm and enable early salvage surgery, there will be additional follow up with frequent MRI and endoscopy. The primary outcome of the study is three-year local recurrence rate. Secondary outcomes are morbidity, disease free and overall survival, stoma rate, functional outcomes, health related quality of life and costs. The design is a non inferiority study with a total sample size of 302 patients. Discussion The results of the TESAR trial will potentially demonstrate that adjuvant chemoradiotherapy is an oncological safe treatment option in patients who are confronted with the difficult clinical dilemma of a radically removed intermediate risk early rectal cancer by polypectomy or transanal surgery that is conventionally treated with subsequent radical surgery. Preserving the rectum using adjuvant radiotherapy is expected to significantly improve morbidity, function and quality of life if compared to completion TME surgery. Trial registration NCT02371304, registration date: February 2015
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Affiliation(s)
- W A A Borstlap
- Department of Surgery, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - P J Tanis
- Department of Surgery, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - T W A Koedam
- Department of Surgery, VU University Medical Center, De Boelelaan 1117, 1081 HZ, Amsterdam, The Netherlands
| | - C A M Marijnen
- Department of Radiotherapy, Leiden University Medical Center, Leiden, The Netherlands
| | - C Cunningham
- Department of Surgery, Oxford University Hospital, Oxford, UK
| | - E Dekker
- Department of Gastroenterology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - M E van Leerdam
- Department of Gastroenterology, Antoni Van Leeuwenhoek, Amsterdam, The Netherlands
| | - G Meijer
- Department of Pathology, Antoni Van Leeuwenhoek, Amsterdam, The Netherlands
| | - N van Grieken
- Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands
| | - I D Nagtegaal
- Department of Pathology, RadboudUMC, Nijmegen, The Netherlands
| | - C J A Punt
- Department of Medical Oncology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - M G W Dijkgraaf
- Clinical Research Unit, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - J H De Wilt
- Department of Surgery, RadboudUMC, Nijmegen, The Netherlands
| | - G Beets
- Department of Surgery, Antoni van Leeuwenhoek, Amsterdam, The Netherlands
| | - E J de Graaf
- Department of Surgery, IJselland Hospital, Capelle aan de Ijssel, The Netherlands
| | | | - M F Gerhards
- Department of surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands
| | | | | | | | - I H J T de Hingh
- Department of Surgery, Catharina Hospital, Eindhoven, The Netherlands
| | - J W A Leijtens
- Department of Surgery, Laurentius Hospital, Roermond, The Netherlands
| | - C Sietses
- Department of Surgery, Gelderse Vallei Hospital, Ede, The Netherlands
| | | | | | - C Hoff
- Department of Surgery, Medisch Centrum Leewarden, Leeuwarden, The Netherlands
| | - J W A Burger
- Department of Surgery, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - A Pronk
- Department of Surgery, Diaconessenziekehuis, Utrecht, The Netherlands
| | - R J I Bosker
- Department of Surgery, Deventer Hospital, Deventer, The Netherlands
| | - H Prins
- Department of Surgery, Jeroen Bosch Hospital, Den Bosch, The Netherlands
| | - A B Smits
- Department of Surgery, Sint. Antonius Hospital, Nieuwegein, The Netherlands
| | - S Bruin
- Department of Surgery, Slotervaart Hospital, Amsterdam, The Netherlands
| | - D D Zimmerman
- Department of Surgery, Elisabeth-TweeSteden Hospital, Tilburg, The Netherlands
| | - L P S Stassen
- Department of Surgery, MUMC, Maastricht, The Netherlands
| | - M S Dunker
- Department of Surgery, Noordwest Ziekenhuisgroep, Alkmaar, The Netherlands
| | - M Westerterp
- Department of Surgery, Medical Center Haaglanden, The Hague, The Netherlands
| | - P P Coene
- Department of Surgery, Maasstad Hospital, Rotterdam, The Netherlands
| | - J Stoot
- Department of Surgery, Zuyderland Hospital, Sittard, The Netherlands
| | - W A Bemelman
- Department of Surgery, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - J B Tuynman
- Department of Surgery, VU University Medical Center, De Boelelaan 1117, 1081 HZ, Amsterdam, The Netherlands.
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Affiliation(s)
- G. Meijer
- Philips Research Laboratories; Eindhoven
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30
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Affiliation(s)
- G. Meijer
- Philips Research Laboratories; N.V. Philips' Gloeilampenfabrieken; Eindhoven
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van Lier A, van Rossum P, Lips I, Philippens M, Meijer G, van den Berg C, van Vulpen M, Lagendijk J. TU-C-12A-03: Functional MRI of Esophageal Cancer: Repeatability and Inter-Observer Reproducibility of Geometrically Corrected ADC Maps. Med Phys 2014. [DOI: 10.1118/1.4889293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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32
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Heethuis S, van Rossum P, Lips I, van Vulpen M, Meijer G, van Lier A. WE-G-18C-04: Comparison of Image Registration Strategies to Improve DCE-MRI Uptake Curves in Esophageal Cancer. Med Phys 2014. [DOI: 10.1118/1.4889523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Andreychenko A, Heerkens H, Meijer G, van Vulpen M, Lagendijk J, van den Berg C. SU-E-J-07: A Functional MR Protocol for the Pancreatic Tumor Delineation. Med Phys 2014. [DOI: 10.1118/1.4888058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Marx S, Adu Smith D, Abel MJ, Zehentbauer T, Meijer G, Santambrogio G. Imaging cold molecules on a chip. Phys Rev Lett 2013; 111:243007. [PMID: 24483656 DOI: 10.1103/physrevlett.111.243007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Indexed: 06/03/2023]
Abstract
We present the integrated imaging of cold molecules in a microchip environment. The on-chip detection is based on resonance-enhanced multiphoton ionization, which is quantum state selective and generally applicable. We demonstrate and characterize time-resolved spatial imaging and subsequently use it to analyze the effect of a phase-space manipulation sequence aimed at compressing the velocity distribution of a molecular ensemble with a view to future high-resolution spectroscopic studies. The realization of such on-chip measurements adds the final fundamental component to the molecule chip, offering a new and promising route for investigating cold molecules.
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Affiliation(s)
- S Marx
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - D Adu Smith
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - M J Abel
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - T Zehentbauer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - G Meijer
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany and Radboud University of Nijmegen, Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - G Santambrogio
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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van Lier A, Meijer G, Moerland M, Lever F, Reerink O, Vulpen M, Lagendijk J, Lips I, van den Berg C. TH-C-WAB-09: Diffusion Weighted MRI of Esophageal Cancer. Med Phys 2013. [DOI: 10.1118/1.4815766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Kirste M, Wang X, Schewe HC, Meijer G, Liu K, van der Avoird A, Janssen LMC, Gubbels KB, Groenenboom GC, van de Meerakker SYT. Quantum-State Resolved Bimolecular Collisions of Velocity-Controlled OH with NO Radicals. Science 2012. [DOI: 10.1126/science.1229549] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Lips I, Lever F, Reerink O, Moerland M, Meijer G, van Lier A, van den Berg C, Philippens M, Crijns S, Raaymakers B, van Vulpen M, Lagendijk J. SU-E-J-57: MRI-Linac (MRL) Guided Treatment for Esophageal Cancer. Med Phys 2012; 39:3665. [PMID: 28517602 DOI: 10.1118/1.4734892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
For radiotherapy, oesophageal cancer is located in a difficult area. Spatial control of the dose distribution is difficult to achieve with current CT-based radiation techniques, as on CT, soft-tissue contrast is too low. Furthermore, the oesophagus moves and organs at risk (e.g. lung, heart, liver, spinal cord) are in close proximity. An 1.5 T MRI-accelerator (MRL) has sufficient soft-tissue tumour visualization possibilities to allow for precise real-time, online, position verification and for dose escalation without organ at riskoverdose. Our research consists of the preparatory work for the first clinical study on the MRL for patients with oesophageal cancer. To improve image quality and reduce the motion artefacts, the benefit of cardiac triggering and breath holds is evaluated on fifteen oesophageal patients. Results show the superb image quality of these MRI sequences. The use of this high quality MRI gives the possibility for non-invasive real-time visualization andtracking of the tumour. We quantify oesophageal tumour motion on cineMRI. The tumour is tracked on sequential mixed T1/T2w images (acquisition time: 60s, temporal resolution: 0.5s, slice thickness: 7mm) of a single coronal and sagittal slice using a Minimum Output Sum of Squared Error (MOSSE) adaptive correlation filter. Tumour registration within the individual images can typically be done at a millisecond time scale. Motion of oesophageal tumours can well be tracked and is highly variable between patients. The greatest mobility is seen in cranio-caudal direction, with amaximum peak-to-peak amplitude of tumour movement of 24.5mm followed by the dorso-ventral and the medio-lateral direction. Movement seems greatest in tumours located in the lower part of the oesophagus. This study shows both the superb image quality for GTV localisation and the possibility for on-line and real time tumour tracking. The study opens thepossibility for tracked radiation delivery with a 1.5T MRI accelerator. Partial funding has been obtained by Elekta and Philips.
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Steenhuijsen J, Schuring D, Rosario T, Bal M, Meijer G. EP-1388 DELIVERY ACCURACY OF TREATMENT PLANS FOR DOSE PAINTING BY NUMBERS. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71721-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Schuring D, Steenhuijsen J, Bal M, Meijer G. OC-0552 DOSE PAINTING BY NUMBERS: HOW MANY SEGMENTS ARE NEEDED TO CREATE CLINICALLY ACCEPTABLE PLANS? Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70891-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Verhamme L, Maal T, Soehardi R, Bergé S, Meijer G. Validation of implant placement in the edentulous maxilla using a mucosa supported surgical template. Int J Oral Maxillofac Surg 2011. [DOI: 10.1016/j.ijom.2011.07.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Dries W, Steenhuijsen J, Meijer G. SU-E-T-58: A Basic MU-Checker as an Effective Alternative for AAPM-114. Med Phys 2011. [DOI: 10.1118/1.3612009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Meijer G, Bal M, de Jaeger K, Schuring D, Steenhuijsen J, Theuws J. 324 oral DOSE PAINTING BY CONTOURS VERSUS DOSE PAINTING BY NUMBERS FOR LOCALLY ADVANCED LUNG TUMOURS; PRACTICAL IMPLICATIONS OF USING A BROAD OR SHARP BRUSH. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)70446-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Johnson RD, Yannoni CS, Salem J, Meijer G, Bethune DS. Solution and Solid State NMR Studies of the Structure and Dynamics of C60 and C70. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-206-715] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe have investigated the structure and dynamics of C60 and C70 with 13C NMR spectroscopy. In solution, high-resolution spectra reveal that C60 has a single resonance at 143 ppm, indicating a strained, aromatic system with high symmetry. This is strong evidence for a C60 “soccer ball” geometry. A 2D NMR INADEQUATE experiment on 13C-enriched C70 reveals the bonding connectivity to be a linear string, in firm support of the proposed “rugby ball” structure with D5h symmetry, and furnishes resonance assignments. Solid state NMR spectra of C60 at ambient temperatures yield a narrow resonance, indicative of rapid molecular reorientation. Variable temperature T1 measurements show that the rotational correlation time is ∼ 10−9s at 230 K. At 77 K, this time increases to more than 1 ms, and the 13C NMR spectrum of C60 is a powder pattern due to chemical shift anisotropy (tensor components 220, 186, 40 ppm). At intermediate temperatures a narrow peak is superimposed on the powder pattern, suggesting a distribution of barriers to molecular motion in the sample, or the presence of an additional phase in the solid state. A Carr-Purcell dipolar experiment on C60 in the solid state allows the first precise determination of the C60 bond lengths: 1.45 and 1.40Å.
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Meijer G, Bethune DS, Tang WC, Rosen HJ, Johnson RD, Wilson RJ, Chambliss DD, Golden WG, Seki H, De Vries MS, Brown CA, Salem JR, Hunziker HE, Wendt HR. Laser Deposition, Vibrational Spectroscopy, NMR Spectroscopy and Stm Imaging of C60 and C70. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-206-619] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe recently demonstrated that C60 and C70, as well as other fullerenes, can be deposited and accumulated on surfaces using laser ablation of graphite in an Inert gas atmosphere. After learning of the work of Krätschmer et al. indicating the presence of C60 in carbon soot, we showed that samples consisting almost exclusively of C60 and C70 can be sublimed from such soot. Vibrational Raman spectra of C60 and C70 were obtained from these samples. The C60 spectrum Is consistent with the calculated spectrum of Buckmlnsterfullerene, and the strongest three lines can be assigned on the basis of frequency and polarization. The NMR spectrum of dissolved C60 was then obtained, and found to consist of a single resonance, establishing the icosahedral symmetry of this molecule. STM images of the C60 molecules on a Au(111) crystal face show that these clusters form hexagonal arrays with an intercluster spacing of 11.0 Å and are mobile at ambient temperature. Distinctly taller species evident in the arrays are believed to be C70 clusters. Vibrational Raman and infrared spectra have also been obtained for separated C60 and C70.
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Harding DJ, Gruene P, Haertelt M, Meijer G, Fielicke A, Hamilton SM, Hopkins WS, Mackenzie SR, Neville SP, Walsh TR. Probing the structures of gas-phase rhodium cluster cations by far-infrared
spectroscopy. J Chem Phys 2010; 133:214304. [DOI: 10.1063/1.3509778] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D. J. Harding
- Fritz-Haber-Institut der
Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin,
Germany
- Department of Chemistry, University of
Warwick, Coventry CV4 7AL, United Kingdom
| | - P. Gruene
- Fritz-Haber-Institut der
Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin,
Germany
| | - M. Haertelt
- Fritz-Haber-Institut der
Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin,
Germany
| | - G. Meijer
- Fritz-Haber-Institut der
Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin,
Germany
| | - A. Fielicke
- Fritz-Haber-Institut der
Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin,
Germany
| | - S. M. Hamilton
- Department of Chemistry, Physical and Theoretical Chemistry
Laboratory, University of Oxford, South Parks Road, Oxford OX1
3QZ, United Kingdom
| | - W. S. Hopkins
- Department of Chemistry, Physical and Theoretical Chemistry
Laboratory, University of Oxford, South Parks Road, Oxford OX1
3QZ, United Kingdom
| | - S. R. Mackenzie
- Department of Chemistry, Physical and Theoretical Chemistry
Laboratory, University of Oxford, South Parks Road, Oxford OX1
3QZ, United Kingdom
| | - S. P. Neville
- Department of Chemistry, University of
Warwick, Coventry CV4 7AL, United Kingdom
| | - T. R. Walsh
- Department of Chemistry, University of
Warwick, Coventry CV4 7AL, United Kingdom
- Centre for Scientific Computing, University of
Warwick, Coventry CV4 7AL, United Kingdom
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Meijer G, Migchielsen J, Schuring D, van der Toorn P, Weterings J, De Wildt M, Bal M. Early Clinical Experience with an Online IGART Protocol for Bladder Cancer Patients by In-room Plan Selection Based on CBCT Images. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Karotki A, Mah K, Meijer G, Meltsner M. Poster - Thur Eve - 39: Dosimetric Evaluation of Bulk Electron Density Based Treatment Planning in IMRT Head and Neck Patients: Can It Be Used for MRI-Based Planning? Med Phys 2010. [DOI: 10.1118/1.3476144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Steenhuijsen J, Meijer G, Zwanenburg A, Bal M. SU-GG-J-02: Dose Painting by Numbers Based on SUV Data for Advanced Lung Tumors. Med Phys 2010. [DOI: 10.1118/1.3468225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Harding DJ, Walsh TR, Hamilton SM, Hopkins WS, Mackenzie SR, Gruene P, Haertelt M, Meijer G, Fielicke A. Communications: The structure of Rh8+ in the gas phase. J Chem Phys 2010; 132:011101. [DOI: 10.1063/1.3285266] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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van den Akker PC, van Essen AJ, Kraak MMJ, Meijer R, Nijenhuis M, Meijer G, Hofstra RMW, Pas HH, Scheffer H, Jonkman MF. Long-term follow-up of patients with recessive dystrophic epidermolysis bullosa in the Netherlands: expansion of the mutation database and unusual phenotype-genotype correlations. J Dermatol Sci 2009; 56:9-18. [PMID: 19665875 DOI: 10.1016/j.jdermsci.2009.06.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2009] [Revised: 05/23/2009] [Accepted: 06/25/2009] [Indexed: 12/15/2022]
Abstract
BACKGROUND The current classification of recessive dystrophic epidermolysis bullosa (RDEB) comprises two major subtypes: 'severe generalized RDEB' (RDEB-sev gen) with early-onset, extensive, generalized blistering and scarring, complete absence of type VII collagen, and bi-allelic COL7A1 null mutations; milder 'generalized other RDEB' (RDEB-O) with reduced-to-normal type VII collagen expression, and non-null genotypes. OBJECTIVE To search for previously unrecognized phenotype-genotype correlations in 33 Dutch RDEB families. METHODS We analyzed extensive clinical follow-up data, available for all patients up to 19 years, detailed type VII collagen immunostaining and genotypes, and correlated clinical phenotype to molecular phenotype and genotype. RESULTS We identified 20 novel COL7A1 mutations. In 14 of 15 RDEB-sev gen patients type VII collagen was completely absent, one had strongly reduced type VII collagen, and all carried bi-allelic null mutations. Five of 11 RDEB-O patients developed pseudosyndactyly of the fingers preceded by skin atrophy and flexion contractures later in childhood and adolescence. All five had esophageal involvement and growth retardation. Type VII collagen immunostaining ranged from strongly reduced to slightly reduced in RDEB-O patients with pseudosyndactyly, whereas RDEB-O patients without pseudosyndactyly had slightly reduced to normal type VII collagen staining. There was no difference in genotypes between both groups, although we unexpectedly found bi-allelic null mutations in two of five RDEB-O patients with pseudosyndactyly. CONCLUSION Pseudosyndactyly occurs in approximately half of RDEB-O patients when type VII collagen is strongly reduced. The prognosis in RDEB cannot always be simply predicted from the COL7A1 genotype.
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Affiliation(s)
- Peter C van den Akker
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
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