Patient position alters attenuation effects in multipinhole cardiac SPECT

Medical Physics
Rachel TimminsR Glenn Wells

Abstract

Dedicated cardiac cameras offer improved sensitivity over conventional SPECT cameras. Sensitivity gains are obtained by large numbers of detectors and novel collimator arrangements such as an array of multiple pinholes that focus on the heart. Pinholes lead to variable amounts of attenuation as a source is moved within the camera field of view. This study evaluated the effects of this variable attenuation on myocardial SPECT images. Computer simulations were performed for a set of nine point sources distributed in the left ventricular wall (LV). Sources were placed at the location of the heart in both an anthropomorphic and a water-cylinder computer phantom. Sources were translated in x, y, and z by up to 5 cm from the center. Projections were simulated with and without attenuation and the changes in attenuation were compared. A LV with an inferior wall defect was also simulated in both phantoms over the same range of positions. Real camera data were acquired on a Discovery NM530c camera (GE Healthcare, Haifa, Israel) for five min in list-mode using an anthropomorphic phantom (DataSpectrum, Durham, NC) with 100 MBq of Tc-99m in the LV. Images were taken over the same range of positions as the simulations and were compared based...Continue Reading

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Oct 25, 2014·Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology·Amir PourmoghaddasR Glenn Wells

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Citations

Jul 16, 2016·Medical & Biological Engineering & Computing·John A Kennedy, H William Strauss
Nov 4, 2016·Medical Physics·Amir Pourmoghaddas, R Glenn Wells
Mar 27, 2018·Medical Physics·Sarah G Cuddy-Walsh, R Glenn Wells
Feb 7, 2019·Physics in Medicine and Biology·Jing Wu, Chi Liu
May 3, 2019·Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology·R Glenn Wells, Terrence D Ruddy
Mar 4, 2020·Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology·R Glenn Wells, Ran Klein
Aug 26, 2018·Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology·Brian G AbbottR Glenn Wells
Jul 25, 2019·Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology·Sarah G Cuddy-Walsh, R Glenn Wells

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