Simultaneous attenuation and depth-dependent resolution compensation for 180 degrees myocardial perfusion SPECT

Ye, J.; Cullom, S. James; Galt, James R.; Kearfott, Kimberlee J.; Garcia, E.V.

doi:10.1109/nssmic.1992.301474

Cited by 1 publication

(3 citation statements)

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“…The generalized Gaussian Markov random field (ggmrf) prior [14] model has the Gibbs energy of (4) where set of all neighboring pixel pairs; coefficient linking pixels and ; scale parameter proportional to the scale of , and . Smaller values of tend to produce sharper edges.…”

Section: B Image Reconstructionmentioning

confidence: 99%

“…In terms of lesion contrast, 180 was better in cardiac phantom images, but only for a smaller (23 mm) defect; no difference was found with a larger (45 mm) defect [2], [3]. With attenuation and resolution compensation in cardiac phantom images, comparable defect contrast was observed for 180 and 360 [4]. However, in a recent study, a 360 scan showed better contrast for defects located in the inferobasal wall than a 180 scan [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, in a recent study, a 360 scan showed better contrast for defects located in the inferobasal wall than a 180 scan [5]. In terms of nonuniform intensity artifacts in the phantom myocardium, 360 was shown to be superior [2]- [4] except in the apical region [4]. The 180 was recommended based on a study of normal dogs [6]; however, the conclusion was based on a subjective comparison between anterior 180 reconstructed images and a single posterior 180 image.…”

Section: Introductionmentioning

confidence: 99%

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An evaluation of cardiac uniformity, contrast, and SNR with dual-head 180/spl deg/ and triple-head 360/spl deg/ SPECT scans

Jaszczak

Bowsher

et al. 2001

IEEE Trans. Nucl. Sci.

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An experimental phantom study was performed to evaluate cardiac uniformity, contrast, and signal-to-noise ratio for two clinical cardiac SPECT imaging protocols: adjacent dual-head 180 and triple-head 360 scans. One head of a SPECT camera was used to acquire 180 and 360 projections with different times per step to simulate the clinical case where dual-head 180 and triple-head 360 each takes a total of 20 min. Scans were acquired with no lesion, anterior lesion, and posterior lesion in the myocardium. Maximum a posteriori reconstruction was done by an iterative coordinate descent algorithm using a quadratic convex prior. The L-curve method was used to obtain the prior strength. Some investigation was done on obtaining the L-curve and on the ways to fit the L-curve and to get the corner point. Images both with attenuation and scatter correction (ASC) and without ASC were compared. The 180 scan shows an intensity decrease in anterior apical and posterior basal regions. The 360 scan shows an intensity decrease in the posterior wall. For the anterior lesion, the 180 scan has slightly better contrast, while for the posterior lesion, the 360 scan has slightly better contrast. The difference between the 180 and 360 scans is subtle, and the comparison results depend on the lesion position and the view angle of the heart. A receiver operating characteristic study of 180 versus 360 acquisition designed based on these characterizations of contrast, uniformity, and noise will be necessary to evaluate overall performance.

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Section: B Image Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%