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Jia MJ, Cao X, Gunn JR, Bruza P, Jiang S, Pogue BW. Tomographic Cherenkov-excited luminescence scanned imaging with multiple pinhole beams recovered via back-projection reconstruction. Opt Lett 2019; 44:1552-1555. [PMID: 30933088 PMCID: PMC7104332 DOI: 10.1364/ol.44.001552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 02/16/2019] [Indexed: 05/22/2023]
Abstract
Cherenkov-excited luminescence scanned imaging (CELSI) is achieved with a clinical linear accelerator during external beam radiotherapy to map out molecular luminescence intensity or lifetime in tissue. In order to realize a deeper imaging depth with a reasonable spatial resolution in CELSI, we optimized the original scanning procedure to complete this in a way similar to x-ray computed tomography and with image reconstruction from maximum-likelihood expectation maximization and multi-pinhole irradiation for parallelization. Resolution phantom studies showed that a 0.3 mm diameter capillary tube containing 0.01 nM luminescent nanospheres could be recognized at a depth of 21 mm into tissue-like media. Small animal imaging with a 1 mm diameter cylindrical target demonstrated that fast 3D data acquisition can be achieved by this multi-pinhole collimator approach to image high-resolution luminescence through a whole animal.
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Nashed YSG, Vine DJ, Peterka T, Deng J, Ross R, Jacobsen C. Parallel ptychographic reconstruction. Opt Express 2014; 22:32082-97. [PMID: 25607174 PMCID: PMC4317139 DOI: 10.1364/oe.22.032082] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/17/2014] [Accepted: 11/19/2014] [Indexed: 05/23/2023]
Abstract
Ptychography is an imaging method whereby a coherent beam is scanned across an object, and an image is obtained by iterative phasing of the set of diffraction patterns. It is able to be used to image extended objects at a resolution limited by scattering strength of the object and detector geometry, rather than at an optics-imposed limit. As technical advances allow larger fields to be imaged, computational challenges arise for reconstructing the correspondingly larger data volumes, yet at the same time there is also a need to deliver reconstructed images immediately so that one can evaluate the next steps to take in an experiment. Here we present a parallel method for real-time ptychographic phase retrieval. It uses a hybrid parallel strategy to divide the computation between multiple graphics processing units (GPUs) and then employs novel techniques to merge sub-datasets into a single complex phase and amplitude image. Results are shown on a simulated specimen and a real dataset from an X-ray experiment conducted at a synchrotron light source.
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Affiliation(s)
- Youssef S. G. Nashed
- Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439,
USA
| | - David J. Vine
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439,
USA
| | - Tom Peterka
- Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439,
USA
| | - Junjing Deng
- Applied Physics, Northwestern University, Evanston, Illinois 60208,
USA
| | - Rob Ross
- Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439,
USA
| | - Chris Jacobsen
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439,
USA
- Applied Physics, Northwestern University, Evanston, Illinois 60208,
USA
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Krishnaswamy V, Michaelsen KE, Pogue BW, Poplack SP, Shaw I, Defrietas K, Brooks K, Paulsen KD. A digital x-ray tomosynthesis coupled near infrared spectral tomography system for dual-modality breast imaging. Opt Express 2012; 20:19125-36. [PMID: 23038553 PMCID: PMC3601817 DOI: 10.1364/oe.20.019125] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A Near Infrared Spectral Tomography (NIRST) system has been developed and integrated into a commercial Digital Breast Tomosynthesis (DBT) scanner to allow structural and functional imaging of breast in vivo. The NIRST instrument uses an 8-wavelength continuous wave (CW) laser-based scanning source assembly and a 75-element silicon photodiode solid-state detector panel to produce dense spectral and spatial projection data from which spectrally constrained 3D tomographic images of tissue chromophores are produced. Integration of the optical imaging system into the DBT scanner allows direct co-registration of the optical and DBT images, while also facilitating the synergistic use of x-ray contrast as anatomical priors in optical image reconstruction. Currently, the total scan time for a combined NIRST-DBT exam is ~50s with data collection from 8 wavelengths in the optical scan requiring ~42s to complete. The system was tested in breast simulating phantoms constructed using intralipid and blood in an agarose matrix with a 3 cm x 2 cm cylindrical inclusion at 1 cm depth from the surface. Diffuse image reconstruction of total hemoglobin (HbT) concentration resulted in accurate recovery of the lateral size and position of the inclusion to within 6% and 8%, respectively. Use of DBT structural priors in the NIRST reconstruction process improved the quantitative accuracy of the HbT recovery, and led to linear changes in imaged versus actual contrast, underscoring the advantages of dual-modality optical imaging approaches. The quantitative accuracy of the system can be further improved with independent measurements of scattering properties through integration of frequency or time domain data.
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Aquila A, Hunter MS, Doak RB, Kirian RA, Fromme P, White TA, Andreasson J, Arnlund D, Bajt S, Barends TRM, Barthelmess M, Bogan MJ, Bostedt C, Bottin H, Bozek JD, Caleman C, Coppola N, Davidsson J, DePonte DP, Elser V, Epp SW, Erk B, Fleckenstein H, Foucar L, Frank M, Fromme R, Graafsma H, Grotjohann I, Gumprecht L, Hajdu J, Hampton CY, Hartmann A, Hartmann R, Hau-Riege S, Hauser G, Hirsemann H, Holl P, Holton JM, Hömke A, Johansson L, Kimmel N, Kassemeyer S, Krasniqi F, Kühnel KU, Liang M, Lomb L, Malmerberg E, Marchesini S, Martin AV, Maia FRNC, Messerschmidt M, Nass K, Reich C, Neutze R, Rolles D, Rudek B, Rudenko A, Schlichting I, Schmidt C, Schmidt KE, Schulz J, Seibert MM, Shoeman RL, Sierra R, Soltau H, Starodub D, Stellato F, Stern S, Strüder L, Timneanu N, Ullrich J, Wang X, Williams GJ, Weidenspointner G, Weierstall U, Wunderer C, Barty A, Spence JCH, Chapman HN. Time-resolved protein nanocrystallography using an X-ray free-electron laser. Opt Express 2012; 20:2706-16. [PMID: 22330507 PMCID: PMC3413412 DOI: 10.1364/oe.20.002706] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 12/16/2011] [Accepted: 12/18/2011] [Indexed: 05/17/2023]
Abstract
We demonstrate the use of an X-ray free electron laser synchronized with an optical pump laser to obtain X-ray diffraction snapshots from the photoactivated states of large membrane protein complexes in the form of nanocrystals flowing in a liquid jet. Light-induced changes of Photosystem I-Ferredoxin co-crystals were observed at time delays of 5 to 10 µs after excitation. The result correlates with the microsecond kinetics of electron transfer from Photosystem I to ferredoxin. The undocking process that follows the electron transfer leads to large rearrangements in the crystals that will terminally lead to the disintegration of the crystals. We describe the experimental setup and obtain the first time-resolved femtosecond serial X-ray crystallography results from an irreversible photo-chemical reaction at the Linac Coherent Light Source. This technique opens the door to time-resolved structural studies of reaction dynamics in biological systems.
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Affiliation(s)
- Andrew Aquila
- Center for Free-Electron Laser Science, DESY, Notkestraße 85, 22607 Hamburg, Germany.
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Lin Y, Barber WC, Iwanczyk JS, Roeck W, Nalcioglu O, Gulsen G. Quantitative fluorescence tomography using a combined tri-modality FT/DOT/XCT system. Opt Express 2010; 18:7835-50. [PMID: 20588625 PMCID: PMC2898749 DOI: 10.1364/oe.18.007835] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Revised: 03/02/2010] [Accepted: 03/10/2010] [Indexed: 05/20/2023]
Abstract
In this work, a first-of-its-kind fully integrated tri-modality system that combines fluorescence, diffuse optical and x-ray tomography (FT/DOT/XCT) into the same setting is presented. The purpose of this system is to perform quantitative fluorescence tomography using multi-modality imaging approach. XCT anatomical information is used as structural priori while optical background heterogeneity information obtained by DOT measurements is used as functional priori. The performance of the hybrid system is evaluated using multi-modality phantoms. In particular, we show that a 2.4 mm diameter fluorescence inclusion located in a heterogeneous medium can be localized accurately with the functional a priori information, although the fluorophore concentration is recovered with 70% error. On the other hand, the fluorophore concentration can be accurately recovered within 8% error only when both DOT optical background functional and XCT structural a priori information are utilized to guide and constrain the FT reconstruction algorithm.
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Affiliation(s)
- Yuting Lin
- Tu and Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA 92697
USA
| | | | | | - Werner Roeck
- Tu and Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA 92697
USA
| | - Orhan Nalcioglu
- Tu and Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA 92697
USA
| | - Gultekin Gulsen
- Tu and Yuen Center for Functional Onco-Imaging, University of California, Irvine, CA 92697
USA
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