Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Carl R. Crawford"'
Publikováno v:
Journal of medical imaging (Bellingham, Wash.). 8(5)
Computed tomography was one of the first imaging modalities to require a computerized solution of an inverse problem to produce a useful image from the data acquired by the sensor hardware. The computerized solutions, which are known as image reconst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e9840bc521d00864d59a0fc4e2c6eb5
https://pubmed.ncbi.nlm.nih.gov/34660842
https://pubmed.ncbi.nlm.nih.gov/34660842
Autor:
Matthew Hirsch, Sergey Simanovsky, Carl R. Crawford, David Schafer, Zhengrong Ying, Ram Naidu, Basak Ulker Karbeyaz
Publikováno v:
IEEE Transactions on Medical Imaging. 27:897-906
We present an algorithm to reconstruct helical cone beam computed tomography (CT) data acquired at variable pitch. The algorithm extracts a halfscan segment of projections using an extended version of the advanced single slice rebinning (ASSR) algori
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19d8ecb78b09d9298e50d773f8d63a5d
https://doi.org/10.1109/tmi.2008.922689
https://doi.org/10.1109/tmi.2008.922689
Publikováno v:
IEEE Transactions on Medical Imaging. 15:327-332
Respiratory motion during the collection of computed tomography (CT) projections generates structured artifacts and a loss of resolution that can render the scans unusable. This motion is problematic in scans of those patients who cannot suspend resp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77ebd98d9e765c8c8abaca7986566744
https://doi.org/10.1109/42.500141
https://doi.org/10.1109/42.500141
Publikováno v:
IEEE Transactions on Medical Imaging. 15:188-196
Images generated with helical scanning are degraded by partial volume artifacts caused by an increased slice thickness when compared to conventional computed tomography (CT) scanning. The slice thickness for a helical scan is proportional to the sum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0379075d59318d8df5e68db502efb311
https://doi.org/10.1109/42.491420
https://doi.org/10.1109/42.491420
Publikováno v:
Magnetic Resonance in Medicine. 34:156-160
Spiral scanning gradient waveforms can be optimized with respect to blurring from off-resonance effects by minimizing the readout time. This is achieved by maximizing the gradient amplitude during the scan so that the edge of k-space is reached as qu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdb38c9c6cad1a0e4717621e54c07a7d
https://doi.org/10.1002/mrm.1910340205
https://doi.org/10.1002/mrm.1910340205
Publikováno v:
Medical Physics. 17:264-272
A method is presented for estimating the geometrical parameters for a cone beam detector geometry from the coordinates of the centroid of a projected point source sampled over 360°. Nonlinear expressions are derived for the coordinates of the centro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::87f329afbb2a51092ed91aa872a0de67
https://doi.org/10.1118/1.596505
https://doi.org/10.1118/1.596505
Publikováno v:
2007 IEEE Sensors Applications Symposium.
Various imaging sensors have been used for luggage screening for explosive detection. Recent developments in dual energy X-ray volumetric computed tomography (CT) have demonstrated its advantages over other imaging sensors for luggage screening. Thes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d7d42fef6fd9e11c3acfd462051c354
https://doi.org/10.1109/sas.2007.374371
https://doi.org/10.1109/sas.2007.374371
Publikováno v:
Images of the Twenty-First Century. Proceedings of the Annual International Engineering in Medicine and Biology Society.
In order to gain a better understanding of X-ray computed tomography (CT) motion artifacts, a 3-D motion control system is described. Two preliminary experiments were performed in which the system was scanned while simulating physiological motion. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::20d3dce9515e233cfa28c23b13982868
https://doi.org/10.1109/iembs.1989.95835
https://doi.org/10.1109/iembs.1989.95835
Publikováno v:
Images of the Twenty-First Century. Proceedings of the Annual International Engineering in Medicine and Biology Society.
The authors report on an analysis of motion artifacts by retrospectively reconstructing partial scan images, scanning moving phantoms, and using computer simulations of the scanner and moving object. The partial scan reconstructions eliminated some a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09f902387671a9f7fe88787ff1862f0b
https://doi.org/10.1109/iembs.1989.95834
https://doi.org/10.1109/iembs.1989.95834
Publikováno v:
IEEE transactions on medical imaging. 15(3)
Cardiac and respiratory motion can cause artifacts in computed tomography scans of the chest. The authors describe a new method for reducing these artifacts called pixel-specific back-projection (PSBP). PSBP reduces artifacts caused by in-plane motio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::220d66258a7e9db45964c09bbce24294
https://pubmed.ncbi.nlm.nih.gov/18215914
https://pubmed.ncbi.nlm.nih.gov/18215914