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Peiffer C, Brombal L, Maughan Jones CJ, Arfelli F, Astolfo A, Dreossi D, Endrizzi M, Hagen CK, Mazzolani A, Menk R, Rigon L, Olivo A, Munro PRT. On the equivalence of the X-ray scattering retrieval with beam tracking and analyser-based imaging using a synchrotron source. J Phys D Appl Phys 2023; 56:45LT02. [PMID: 37601626 PMCID: PMC10437003 DOI: 10.1088/1361-6463/acee8c] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 07/25/2023] [Accepted: 08/09/2023] [Indexed: 08/22/2023]
Abstract
X-ray phase contrast imaging (XPCI) methods give access to contrast mechanisms that are based on the refractive properties of matter on top of the absorption coefficient in conventional x-ray imaging. Ultra small angle x-ray scattering (USAXS) is a phase contrast mechanism that arises due to multiple refraction events caused by physical features of a scale below the physical resolution of the used imaging system. USAXS contrast can therefore give insight into subresolution structural information, which is an ongoing research topic in the vast field of different XPCI techniques. In this study, we quantitatively compare the USAXS signal retrieved by the beam tracking XPCI technique with the gold standard of the analyzer based imaging XPCI technique using a synchrotron x-ray source. We find that, provided certain conditions are met, the two methods measure the same quantity.
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Affiliation(s)
- C Peiffer
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - L Brombal
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - C J Maughan Jones
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - F Arfelli
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - A Astolfo
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - D Dreossi
- Elettra Sincrotrone Trieste SCpA, S. S. 14 km 163.5, 34012 Basovizza (TS), Italy
| | - M Endrizzi
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - C K Hagen
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - A Mazzolani
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - R Menk
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy
- Elettra Sincrotrone Trieste SCpA, S. S. 14 km 163.5, 34012 Basovizza (TS), Italy
- Department of Computer and Electrical Engineering, Midsweden University, Sundsvall, Sweden
| | - L Rigon
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - A Olivo
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - P R T Munro
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, WC1E 6BT London, United Kingdom
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2
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Pacilè S, Dullin C, Baran P, Tonutti M, Perske C, Fischer U, Albers J, Arfelli F, Dreossi D, Pavlov K, Maksimenko A, Mayo SC, Nesterets YI, Taba ST, Lewis S, Brennan PC, Gureyev TE, Tromba G, Wienbeck S. Free propagation phase-contrast breast CT provides higher image quality than cone-beam breast-CT at low radiation doses: a feasibility study on human mastectomies. Sci Rep 2019; 9:13762. [PMID: 31551475 PMCID: PMC6760215 DOI: 10.1038/s41598-019-50075-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 08/22/2019] [Indexed: 12/09/2022] Open
Abstract
In this study we demonstrate the first direct comparison between synchrotron x-ray propagation-based CT (PB-CT) and cone-beam breast-CT (CB-CT) on human mastectomy specimens (N = 12) including different benign and malignant lesions. The image quality and diagnostic power of the obtained data sets were compared and judged by two independent expert radiologists. Two cases are presented in detail in this paper including a comparison with the corresponding histological evaluation. Results indicate that with PB-CT it is possible to increase the level of contrast-to-noise ratio (CNR) keeping the same level of dose used for the CB-CT or achieve the same level of CNR reached by CB-CT at a lower level of dose. In other words, PB-CT can achieve a higher diagnostic potential compared to the commercial breast-CT system while also delivering a considerably lower mean glandular dose. Therefore, we believe that PB-CT technique, if translated to a clinical setting, could have a significant impact in improving breast cancer diagnosis.
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Affiliation(s)
- S Pacilè
- Elettra Sincrotrone Trieste S.C.p.A., Basovizza, Italy. .,Department of Engineering and Architecture, University of Trieste, Trieste, Italy.
| | - C Dullin
- Elettra Sincrotrone Trieste S.C.p.A., Basovizza, Italy.,Institute for Diagnostic and Interventional Radiology, University Medical Center Goettingen, Goettingen, Germany.,Translational Molecular Imaging, Max-Plank-Institute for Experimental Medicine, Goettingen, Germany
| | - P Baran
- ARC Centre of Excellence in Advanced Molecular Imaging, School of Physics, The University of Melbourne, Parkville, Australia
| | - M Tonutti
- Department of Radiology, Academic Hospital of Trieste, Trieste, Italy
| | - C Perske
- Institute for Pathology, University Medical Center Goettingen, Goettingen, Germany
| | - U Fischer
- Diagnostic Breast Center Goettingen, Goettingen, Germany
| | - J Albers
- Institute for Diagnostic and Interventional Radiology, University Medical Center Goettingen, Goettingen, Germany
| | - F Arfelli
- Department of Physics, University of Trieste, Trieste, Italy
| | - D Dreossi
- Elettra Sincrotrone Trieste S.C.p.A., Basovizza, Italy
| | - K Pavlov
- School of Physical and Chemical Sciences, University of Canterbury, Christchurch, New Zealand.,School of Science and Technology, University of New England, Armidale, Australia.,School of Physics and Astronomy, Monash University, Clayton, Australia
| | | | - S C Mayo
- Commonwealth Scientific and Industrial Research Organisation, Clayton, Australia
| | - Y I Nesterets
- Commonwealth Scientific and Industrial Research Organisation, Clayton, Australia.,School of Science and Technology, University of New England, Armidale, Australia
| | - S Tavakoli Taba
- The University of Sydney, BREAST, Faculty of Health Sciences, Lidcombe, New South Wales, Australia
| | - S Lewis
- The University of Sydney, BREAST, Faculty of Health Sciences, Lidcombe, New South Wales, Australia
| | - P C Brennan
- The University of Sydney, BREAST, Faculty of Health Sciences, Lidcombe, New South Wales, Australia
| | - T E Gureyev
- ARC Centre of Excellence in Advanced Molecular Imaging, School of Physics, The University of Melbourne, Parkville, Australia.,School of Science and Technology, University of New England, Armidale, Australia.,School of Physics and Astronomy, Monash University, Clayton, Australia.,The University of Sydney, BREAST, Faculty of Health Sciences, Lidcombe, New South Wales, Australia
| | - G Tromba
- Elettra Sincrotrone Trieste S.C.p.A., Basovizza, Italy
| | - S Wienbeck
- Institute for Diagnostic and Interventional Radiology, University Medical Center Goettingen, Goettingen, Germany
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3
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Brun F, Di Trapani V, Dreossi D, Rigon L, Longo R, Delogu P. Towards In Vivo K-Edge X-Ray Micro-CT with the Pixirad-I/Pixie-III Detector. IFMBE Proceedings 2019. [DOI: 10.1007/978-981-10-9035-6_22] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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4
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Sarno A, Golosio B, Russo P, Arfelli F, Bellazzini R, Brez A, Brun F, Delogu P, Di Lillo F, Dreossi D, Fedon C, Longo R, Mettivier G, Oliva P, Rigon L, Spandre G, Tromba G. A Framework for Iterative Reconstruction in Phase-Contrast Computed Tomography Dedicated to the Breast. IEEE Trans Radiat Plasma Med Sci 2017. [DOI: 10.1109/trpms.2017.2749059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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5
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Endrizzi M, Vittoria FA, Rigon L, Dreossi D, Iacoviello F, Shearing PR, Olivo A. X-ray Phase-Contrast Radiography and Tomography with a Multiaperture Analyzer. Phys Rev Lett 2017; 118:243902. [PMID: 28665636 DOI: 10.1103/physrevlett.118.243902] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Indexed: 05/23/2023]
Abstract
We present a multiaperture analyzer setup for performing x-ray phase contrast imaging in planar and three-dimensional modalities. The method is based on strongly structuring the x-ray beam with an amplitude modulator, before it reaches the sample, and on a multiaperture analyzing element before detection. A multislice representation of the sample is used to establish a quantitative relation between projection images and the corresponding three-dimensional distributions, leading to successful tomographic reconstruction. Sample absorption, phase, and scattering are retrieved from the measurement of five intensity projections. The method is tested on custom-built phantoms with synchrotron radiation: sample absorption and phase can be reliably retrieved also in combination with strong scatterers, simultaneously attaining high sensitivity and dynamic range.
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Affiliation(s)
- M Endrizzi
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - F A Vittoria
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - L Rigon
- Physics Department, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
- Istituto Nazionale di Fisica Nulceare, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - D Dreossi
- Sincrotrone Trieste SCpA, S.S. 14 km 163.5, 34012 Basovizza Trieste, Italy
| | - F Iacoviello
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, WC1E 7JE, United Kingdom
| | - P R Shearing
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, WC1E 7JE, United Kingdom
| | - A Olivo
- Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom
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Baran P, Pacile S, Nesterets YI, Mayo SC, Dullin C, Dreossi D, Arfelli F, Thompson D, Lockie D, McCormack M, Taba ST, Brun F, Pinamonti M, Nickson C, Hall C, Dimmock M, Zanconati F, Cholewa M, Quiney H, Brennan PC, Tromba G, Gureyev TE. Optimization of propagation-based x-ray phase-contrast tomography for breast cancer imaging. Phys Med Biol 2017; 62:2315-2332. [DOI: 10.1088/1361-6560/aa5d3d] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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7
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Longo R, Arfelli F, Bellazzini R, Brez A, Brun F, Cova M, Delogu P, Di Lillo F, Dreossi D, Fedon C, Golosio B, Mettivier G, Minuti M, Oliva P, Pichera M, Rigon L, Russo P, Sarno A, Spandre G, Tonutti M, Tromba G, Zanconati F. Phase-sensitive breast CT with monochromatic beam towards the clinical trial. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.07.553] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Longo R, Arfelli F, Bellazzini R, Bottigli U, Brez A, Brun F, Brunetti A, Delogu P, Di Lillo F, Dreossi D, Fanti V, Fedon C, Golosio B, Lanconelli N, Mettivier G, Minuti M, Oliva P, Pinchera M, Rigon L, Russo P, Sarno A, Spandre G, Tromba G, Zanconati F. Towards breast tomography with synchrotron radiation at Elettra: first images. Phys Med Biol 2016; 61:1634-49. [PMID: 26836274 DOI: 10.1088/0031-9155/61/4/1634] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of the SYRMA-CT collaboration is to set-up the first clinical trial of phase-contrast breast CT with synchrotron radiation (SR). In order to combine high image quality and low delivered dose a number of innovative elements are merged: a CdTe single photon counting detector, state-of-the-art CT reconstruction and phase retrieval algorithms. To facilitate an accurate exam optimization, a Monte Carlo model was developed for dose calculation using GEANT4. In this study, high isotropic spatial resolution (120 μm)(3) CT scans of objects with dimensions and attenuation similar to a human breast were acquired, delivering mean glandular doses in the range of those delivered in clinical breast CT (5-25 mGy). Due to the spatial coherence of the SR beam and the long distance between sample and detector, the images contain, not only absorption, but also phase information from the samples. The application of a phase-retrieval procedure increases the contrast-to-noise ratio of the tomographic images, while the contrast remains almost constant. After applying the simultaneous algebraic reconstruction technique to low-dose phase-retrieved data sets (about 5 mGy) with a reduced number of projections, the spatial resolution was found to be equal to filtered back projection utilizing a four fold higher dose, while the contrast-to-noise ratio was reduced by 30%. These first results indicate the feasibility of clinical breast CT with SR.
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Bernardini F, Vecchiet A, De Min A, Lenaz D, Mendoza Cuevas A, Gianoncelli A, Dreossi D, Tuniz C, Montagnari Kokelj M. Neolithic pottery from the Trieste Karst (northeastern Italy): A multi-analytical study. Microchem J 2016. [DOI: 10.1016/j.microc.2015.09.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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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10
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Pacilè S, Brun F, Dullin C, Nesterest YI, Dreossi D, Mohammadi S, Tonutti M, Stacul F, Lockie D, Zanconati F, Accardo A, Tromba G, Gureyev TE. Clinical application of low-dose phase contrast breast CT: methods for the optimization of the reconstruction workflow. Biomed Opt Express 2015; 6:3099-3112. [PMID: 26309770 PMCID: PMC4541534 DOI: 10.1364/boe.6.003099] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 07/03/2015] [Accepted: 07/06/2015] [Indexed: 05/29/2023]
Abstract
Results are presented of a feasibility study of three-dimensional X-ray tomographic mammography utilising in-line phase contrast. Experiments were performed at SYRMEP beamline of Elettra synchrotron. A specially designed plastic phantom and a mastectomy sample containing a malignant lesion were used to study the reconstructed image quality as a function of different image processing operations. Detailed evaluation and optimization of image reconstruction workflows have been carried out using combinations of several advanced computed tomography algorithms with different pre-processing and post-processing steps. Special attention was paid to the effect of phase retrieval on the diagnostic value of the reconstructed images. A number of objective image quality indices have been applied for quantitative evaluation of the results, and these were compared with subjective assessments of the same images by three experienced radiologists and one pathologist. The outcomes of this study provide practical guidelines for the optimization of image processing workflows in synchrotron-based phase-contrast mammo-tomography.
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Affiliation(s)
- S. Pacilè
- Elettra - Sincrotrone Trieste S.C.p.A., Basovizza (Trieste),
Italy
- Department of Engineering and Architecture, University of Trieste, Trieste,
Italy
| | - F. Brun
- Elettra - Sincrotrone Trieste S.C.p.A., Basovizza (Trieste),
Italy
- Department of Engineering and Architecture, University of Trieste, Trieste,
Italy
| | - C. Dullin
- Department of Diagnostic and Interventional Radiology, University Hospital Goettingen, Goettingen,
Germany
| | - Y. I. Nesterest
- Commonwealth Scientific and Industrial Research Organisation, Melbourne,
Australia
| | - D. Dreossi
- Elettra - Sincrotrone Trieste S.C.p.A., Basovizza (Trieste),
Italy
| | - S. Mohammadi
- Elettra - Sincrotrone Trieste S.C.p.A., Basovizza (Trieste),
Italy
- The Abdus Salam International Centre for Theoretical Physics, Trieste,
Italy
- now at LAC+ USC Medical Center, Los Angeles, CA,
USA
| | - M. Tonutti
- AOU - Trieste Hospital, Department of Radiology, Trieste,
Italy
| | - F. Stacul
- AOU - Trieste Hospital, Department of Radiology, Trieste,
Italy
| | - D. Lockie
- Maroondah BreastScreen, Melbourne,
Australia
| | - F. Zanconati
- Department of Medical Science-Unit of Pathology, University of Trieste, Trieste,
Italy
| | - A. Accardo
- Department of Engineering and Architecture, University of Trieste, Trieste,
Italy
| | - G. Tromba
- Elettra - Sincrotrone Trieste S.C.p.A., Basovizza (Trieste),
Italy
| | - T. E. Gureyev
- Commonwealth Scientific and Industrial Research Organisation, Melbourne,
Australia
- School of Physics and Astronomy, Monash University, Clayton, VIC,
Australia
- School of Science and Engineering, University of New England, Armidale, NSW,
Australia
- ARC Centre of Excellence in Advanced Molecular Imaging, The University of Melbourne, Parkville,
Australia
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11
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Hagen CK, Diemoz PC, Endrizzi M, Rigon L, Dreossi D, Arfelli F, Lopez FCM, Longo R, Olivo A. Theory and preliminary experimental verification of quantitative edge illumination x-ray phase contrast tomography. Opt Express 2014; 22:7989-8000. [PMID: 24718174 DOI: 10.1364/oe.22.007989] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
X-ray phase contrast imaging (XPCi) methods are sensitive to phase in addition to attenuation effects and, therefore, can achieve improved image contrast for weakly attenuating materials, such as often encountered in biomedical applications. Several XPCi methods exist, most of which have already been implemented in computed tomographic (CT) modality, thus allowing volumetric imaging. The Edge Illumination (EI) XPCi method had, until now, not been implemented as a CT modality. This article provides indications that quantitative 3D maps of an object's phase and attenuation can be reconstructed from EI XPCi measurements. Moreover, a theory for the reconstruction of combined phase and attenuation maps is presented. Both reconstruction strategies find applications in tissue characterisation and the identification of faint, weakly attenuating details. Experimental results for wires of known materials and for a biological object validate the theory and confirm the superiority of the phase over conventional, attenuation-based image contrast.
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Quai E, Longo R, Zanconati F, Jaconelli G, Tonutti M, Abrami A, Arfelli F, Dreossi D, Tromba G, Cova MA. First application of computed radiology to mammography with synchrotron radiation. Radiol med 2012; 118:89-100. [DOI: 10.1007/s11547-012-0847-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 08/23/2011] [Indexed: 11/30/2022]
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13
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Chen RC, Longo R, Rigon L, Zanconati F, De Pellegrin A, Arfelli F, Dreossi D, Menk RH, Vallazza E, Xiao TQ, Castelli E. Measurement of the linear attenuation coefficients of breast tissues by synchrotron radiation computed tomography. Phys Med Biol 2010; 55:4993-5005. [DOI: 10.1088/0031-9155/55/17/008] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R C Chen
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, People's Republic of China.
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14
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Cosmi F, Steimberg N, Dreossi D, Mazzoleni G. Structural analysis of rat bone explants kept in vitro in simulated microgravity conditions. J Mech Behav Biomed Mater 2009; 2:164-72. [DOI: 10.1016/j.jmbbm.2008.06.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2008] [Revised: 06/20/2008] [Accepted: 06/28/2008] [Indexed: 10/21/2022]
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Dreossi D, Abrami A, Arfelli F, Bregant P, Casarin K, Chenda V, Cova MA, Longo R, Menk RH, Quai E, Quaia E, Rigon L, Rokvic T, Sanabor D, Tonutti M, Tromba G, Vascotto A, Zanconati F, Castelli E. The mammography project at the SYRMEP beamline. Eur J Radiol 2008; 68:S58-62. [PMID: 18617344 DOI: 10.1016/j.ejrad.2008.04.038] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Accepted: 04/25/2008] [Indexed: 11/16/2022]
Abstract
A clinical program for X-ray phase contrast (PhC) mammography with synchrotron radiation (SR) has been started in March 2006 at the SYRMEP beamline of Elettra, the SR facility in Trieste, Italy. The original beamline layout has been modified substantially and a clinical facility has been realized. In order to fulfill all security requirements, dedicated systems have been designed and implemented, following redundancy criteria and "fail safe" philosophy. Planar radiographic images are obtained by scanning simultaneously the patient and the detector through the stationary and laminar SR beam. In this first phase of the project a commercial screen-film system has been used as image receptor. Upon approval by the respective authorities, the mammography program is about half way to conclusion. Up to now about 50 patients have been examined. The patients are volunteers recruited by the radiologist after conventional examinations at the hospital resulted in an uncertain diagnosis. As an example one case of PhC SR mammography is shown and compared to conventional digital mammography. Preliminary analysis shows the high diagnostic quality of the PhC SR images that were acquired with equal or less delivered dose compared to the conventional ones.
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Affiliation(s)
- D Dreossi
- Sincrotrone Trieste SCpA, Trieste, Italy.
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16
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Strolka I, Toffanin R, Accardo A, Dreossi D, Frollo I, Vittur F. Numerical simulation of trabecular bone magnetic resonance imaging. Conf Proc IEEE Eng Med Biol Soc 2007; 2004:1088-91. [PMID: 17271872 DOI: 10.1109/iembs.2004.1403353] [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] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A numerical simulation of trabecular bone structure MR imaging is described. The input of the model is derived from synchrotron 3D muCT trabecular bone images with a resolution of 14mummu14mumx14mum. The static magnetic field perturbation in the bone sample induced by the differences in magnetic susceptibility values between mineralized bone and bone marrow is computed and the MRI experiment for a selected imaging sequence is modeled.
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Affiliation(s)
- I Strolka
- Dept. of Radiol., Trieste Univ., Italy
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17
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Cosmi F, Dreossi D. The application of the cell method in a clinical assessment of bone fracture risk. Acta Bioeng Biomech 2007; 9:35-39. [PMID: 18421941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The aim of this paper is to introduce a new technique for in vivo quantification of bone structure fracture risk. The elastic properties of the architecture obtained from bone digital radiographic images are determined using the cell method. Compression tests are simulated and the results of the numerical analysis are indexed. Such an index is considered to be indicative of the bone structure capabilities. The first clinical validation was carried on at CSMMO, Centro Studi Malattie Metaboliche dell'Osso (Gorizia, Italy), showing that this technique can improve the diagnosis and help a physician in the identification of an actual fracture risk. The examination is not expensive, uses instrumentation that is widely available and therefore could be easily introduced in clinical use as a complement to the current osteoporosis diagnosis methodologies.
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Affiliation(s)
- F Cosmi
- Dipartimento di Energetia, University of Trieste, Italy.
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18
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Falcone PM, Baiano A, Zanini F, Mancini L, Tromba G, Dreossi D, Montanari F, Scuor N, Nobile MAD. Three-dimensional Quantitative Analysis of Bread Crumb by X-ray Microtomography. J Food Sci 2006. [DOI: 10.1111/j.1365-2621.2005.tb07182.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [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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19
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Peterzol A, Olivo A, Rigon L, Pani S, Dreossi D. The effects of the imaging system on the validity limits of the ray-optical approach to phase contrast imaging. Med Phys 2006; 32:3617-27. [PMID: 16475760 DOI: 10.1118/1.2126207] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
A theoretical analysis of the x-ray phase contrast imaging and its validation via synchrotron radiation imaging is here presented. Two different mathematical models have been followed: the simpler ray-optical approach and the more rigorous Fresnel-Kirchoff diffraction theory. Subsequently, the conditions upon which the x-ray optical approximation can be used to describe the image formation mechanism have been analyzed, taking into account also the effects due to the finite source size and detector resolution. It is possible to demonstrate that the ray-optics results can also be obtained by opportunely developing the diffraction formalism only with some restrictions on the spatial frequencies present in the final image, without any limitation on the maximum phase shift. The conditions allowing the use of the simplified ray-optical approach to describe the phase contrast images have been here defined and their validation has been proved by means of computer simulations and phantom experiments.
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Affiliation(s)
- A Peterzol
- Dipartimento di Fisica, Università di Trieste e INFN, Sezione di Trieste, Via Valerio 2, 34100 Trieste, Italy.
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Tromba G, Arfelli F, Castelli E, Dreossi D, Longo R, Mancini L, Menk RH, Montanari F, Olivo A, Pani S, Rigon L, Zanini F. Phase-sensitive X-ray imaging at the SYRMEP beamline of Elettra. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302087184] [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: 11/10/2022] Open
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Olivo A, Arfelli F, Dreossi D, Longo R, Menk RH, Pani S, Poropat P, Rigon L, Zanconati F, Castelli E. Preliminary study on extremely small angle x-ray scatter imaging with synchrotron radiation. Phys Med Biol 2002; 47:469-80. [PMID: 11848123 DOI: 10.1088/0031-9155/47/3/308] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Among the medical physics community, there is nowadays a great interest in the possible implementation of scatter imaging techniques, especially in the field of breast imaging. It is well known that malignant lesions and normal tissue differ in their scattering signatures, and thus scattered radiation can provide a powerful tool to distinguish between the two cases. Up to now, most of the proposed techniques rely on the detection of radiation scattered at angles of the order of a few degrees, which in most cases results in very high contrast values. On the other hand, at those relatively large angles the scattered flux is relatively low with respect to the primary, which often implies the necessity of increasing the dose delivered to the sample in order to achieve sufficient statistics. Furthermore, most of these techniques are based on pencil beam set-ups, which results in an increase of the overall duration of the examination. We propose here an alternative approach based on the detection of radiation scattered at extremely small angles, of the order of approximately 100-200 microrad. This results in a relatively high scattered flux (5-10% of the primary) and in the possibility of utilizing a fan beam geometry, which reduces the acquisition times with respect to pencil beam set-ups. Images of several samples have been acquired, demonstrating that the proposed technique results in an increased contrast with respect to absorption imaging. Possible in vivo implementations of the technique at no dose expense are finally discussed.
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Affiliation(s)
- A Olivo
- Dipartimento di Fisica, Università di Trieste e INFN, Italy
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