Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Richard Conwell"'
Publikováno v:
Medical Physics. 37:2796-2803
Purpose: In medical imaging, data scaling is sometimes desired to handle the system complexity, such as uniformity calibration. Since the data are usually saved in short integer, conventional data scaling will first scale the data in floating point f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f6476364e06bc3a03744331a2be0550
https://doi.org/10.1118/1.3431573
https://doi.org/10.1118/1.3431573
Publikováno v:
Bai, Chuanyong; Maddahi, Jamshid; Kindem, Joel; Conwell, Richard; Gurley, Michael; & Old, Rex. (2009). Development and evaluation of a new fully automatic motion detection and correction technique in cardiac SPECT imaging. Journal of Nuclear Cardiology, 16(4), pp 580-589. doi: 10.1007/s12350-009-9096-7. Retrieved from: http://www.escholarship.org/uc/item/3jt5c34z
Journal of Nuclear Cardiology
Journal of Nuclear Cardiology
Background In cardiac SPECT perfusion imaging, motion correction of the data is critical to the minimization of motion introduced artifacts in the reconstructed images. Software-based (data-driven) motion correction techniques are the most convenient
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b0166db988a6694aa045c8ae9e64ed14
https://doi.org/10.1007/s12350-009-9096-7
https://doi.org/10.1007/s12350-009-9096-7
Autor:
Chuanyong Bai, Richard Conwell
Publikováno v:
2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC).
In cardiac perfusion studies (both PET and SPECT) with CT-based attenuation correction, intensive efforts have been made to minimize the emission/transmission misregistration in order to minimize the errors introduced by the misregistration in the at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::efa7cadcf2b391f07aef5a78c57d9f72
https://doi.org/10.1109/nssmic.2012.6551720
https://doi.org/10.1109/nssmic.2012.6551720
Publikováno v:
2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC).
Bad pixel correction on pixelated solid-state detectors typically uses the average of the direct neighboring pixels (AVG) to derive the value of a bad pixel. However, the AVG approach was suboptimal for high resolution imaging. Therefore, we develope
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dff600cccd812826478b03bd0eb43459
https://doi.org/10.1109/nssmic.2012.6551665
https://doi.org/10.1109/nssmic.2012.6551665
Autor:
Richard Conwell, Chuanyong Bai, Romer De Los Santos, Michael Gurley, Joel Kindem, Hetal Babla, Diana Solis
Publikováno v:
2011 IEEE Nuclear Science Symposium Conference Record.
Respiratory motion gating (R-Gating) in SPECT myocardial perfusion imaging (MPI) usually requires external devices and extra work of the technologist for patient setup. In this paper, we developed an operator-passive R-Gating technique without extern
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b04882a169470394b93fa7cc92310ae8
https://doi.org/10.1109/nssmic.2011.6153739
https://doi.org/10.1109/nssmic.2011.6153739
Publikováno v:
2011 IEEE Nuclear Science Symposium Conference Record.
Background: Thallium doped CsI(Tl) scintillators read out with PIN photodiodes have been successfully used for high performance pixilated solid-state gamma cameras for cardiac SPECT and general nuclear systems. These cameras allow for both emission a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e6edc02ed89897b5184602e9363ca32
https://doi.org/10.1109/nssmic.2011.6154646
https://doi.org/10.1109/nssmic.2011.6154646
Publikováno v:
2011 IEEE Nuclear Science Symposium Conference Record.
Background: Myocardium counts in the projection data and myocardium wall ratios in the reconstructed images have been used to find the optimal angular sampling for 180° supine SPECT imaging. However, supine and upright images demonstrate different s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6e709a0405ce9805edd9d8d52f8b0d3
https://doi.org/10.1109/nssmic.2011.6152964
https://doi.org/10.1109/nssmic.2011.6152964
Autor:
Richard Conwell, Chuanyong Bai
Publikováno v:
IEEE Nuclear Science Symposuim & Medical Imaging Conference.
Detector non-uniformity can potentially introduce detectable artifacts into SPECT images. The degree of non-uniformity and the position of the non-uniform area on the detector surface determine the position and severity of the introduced artifacts. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe1696ff7ee084db1f13c0717491a1a0
https://doi.org/10.1109/nssmic.2010.5874158
https://doi.org/10.1109/nssmic.2010.5874158
Publikováno v:
IEEE Nuclear Science Symposuim & Medical Imaging Conference.
We have developed a CsI(Tl)/PIN detector module for high resolution SPECT and low dose photon-counting CT imaging. Using the detector modules with 6.1mm pixels, we built a cardiac SPECT system with three detector heads. The detector heads form a trip
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a577389a0a57b10be270c7a54fe89b7b
https://doi.org/10.1109/nssmic.2010.5874123
https://doi.org/10.1109/nssmic.2010.5874123
Autor:
Chuanyong Bai, Richard Conwell
Publikováno v:
IEEE Nuclear Science Symposuim & Medical Imaging Conference.
Accurate attenuation correction (AC) requires matched emission (EM) and transmission (TX) data. For cardiac SPECT imaging with AC, historically TX data is only acquired in a non-gated manner and AC is only performed on the summed EM data. Considering
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0996c394191e55bbcf22780cbdedddbb
https://doi.org/10.1109/nssmic.2010.5874282
https://doi.org/10.1109/nssmic.2010.5874282