Image Artifacts

DePuey, E. Gordon

doi:10.1093/med/9780199392094.003.0008

Cited by 3 publications

(1 citation statement)

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“…An example would be the basal myocardial septal region that consists of membranous tissue rather than muscle that in some individuals has a longer length. 74 The result can be an apparent perfusion defect in the basal septum, but with experience, the finding is usually recognized as normal variant anatomy, often by examining the basal septum in the horizontal long-axis view, noting that the septal wall is shorter than the lateral wall but normal with smooth, curved contour at the base. Nevertheless, there are circumstances in which the defect can be real.…”

Section: Normal Anatomy Vs True Pathologymentioning

confidence: 99%

Pitfalls and Limitations of Radionuclide and Hybrid Cardiac Imaging

Travin

2015

Seminars in Nuclear Medicine

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Section: Normal Anatomy Vs True Pathologymentioning

confidence: 99%

Pitfalls and Limitations of Radionuclide and Hybrid Cardiac Imaging

Travin

2015

Seminars in Nuclear Medicine

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Motion detection and amelioration in a dedicated cardiac solid-state CZT SPECT device

Kennedy

Strausś

2016

Med Biol Eng Comput

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A solid-state cadmium zinc tellurium (CZT) dedicated multipinhole cardiac camera which acquires all views simultaneously has been introduced for myocardial SPECT acquisition. We report a method to detect and ameliorate patient motion artifacts in myocardial perfusion imaging (MPI) studies recorded with this device. To detect motion, a myocardial phantom study was recorded, and at mid-scan, the phantom was moved stepwise along each of 6 orthogonal directions, causing MPI artifacts. Using QPS software (Cedars-Sinai) and an in-house normal database, displacements giving artifactual perfusion defects (total perfusion deficit score, TPD, >5 %) were all 1.5 cm or greater (11.2 ± 1.3 % for 1.5 cm). List mode data were reframed into 10-s steps, and the norm of the changes in center of mass among the 19 projections (32 × 32 matrix, pixel size 2.46 mm) was used as a motion index. Rejection of misregistered data gave artifact-free reconstructions (TPD = 1.0 ± 0.8 %) in phantom scans and reduced blur in a rest/stress clinical study. Blur on the patient's stress scan was consistent with increased motion compared to rest (motion index of 4.4 vs. 3.0 pixels, respectively). For CZT cameras that acquire data from multiple views simultaneously, motion during MPI can cause clinically significant artifacts. Reframing acquisitions into discrete time intervals enables the detection of motion and its amelioration, improving diagnostic accuracy.

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