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Imaging

Simulated Frame-Loss Artifacts in Myocardial Perfusion SPECT Imaging: The Difference Between Single- and Dual-Headed Systems

Gretchen E. Rose Wolf
Journal of Nuclear Medicine Technology December 1998, 26 (4) 248-251;
Gretchen E. Rose Wolf
Department of Nuclear Medicine, Harborview Medical Center, Seattle, Washington
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Abstract

Objective: Right-angle dual-headed tomography has increased cardiac SPECT utility by cutting acquisition time in half which enhances gating capabilities. When gating, however, a deceleration in heart rate, due to a return to baseline rate after stress or lessened anxiety at the end of a study, may significantly affect the last step(s) of a gated study with possible frame or information loss. The purpose of this study was to illustrate the artifacts produced in myocardial perfusion studies when a frame or frames are lost in single- and dual-detector SPECT imaging methodologies.

Methods: A near-normal 99mTc-sestamibi study was obtained using a dual-headed camera system fitted with high-resolution, long-bore collimators. The normal study was processed including all frames (1–32). To demonstrate the effect of losing frames on a dual-headed system, the study was processed three different ways to simulate frame loss.

Results: Loss of frames at the end of a SPECT acquisition results in significant inferoseptal wall defects, left ventricular lumen narrowing, as well as thinning of the anterior and lateral walls. The overall appearance of the heart is a more oval-shaped heart with decreased perfusion. The effect of losing the last frame in a dual-headed camera system as opposed to losing the last frame in a single-headed camera system is more substantial.

Conclusion: A scan resulting in the loss of a frame in either a single- or a dual-headed camera system creates artifacts in the myocardial wall and should always be repeated. It is significant to note that artifacts present in a dual-headed system are much more prevalent than in a single-headed system due to the nature of dual-headed acquisition parameters.

  • artifacts
  • single-photon emission computed tomography
  • frame loss
  • myocardial perfusion
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Journal of Nuclear Medicine Technology: 26 (4)
Journal of Nuclear Medicine Technology
Vol. 26, Issue 4
December 1, 1998
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Simulated Frame-Loss Artifacts in Myocardial Perfusion SPECT Imaging: The Difference Between Single- and Dual-Headed Systems
Gretchen E. Rose Wolf
Journal of Nuclear Medicine Technology Dec 1998, 26 (4) 248-251;

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Simulated Frame-Loss Artifacts in Myocardial Perfusion SPECT Imaging: The Difference Between Single- and Dual-Headed Systems
Gretchen E. Rose Wolf
Journal of Nuclear Medicine Technology Dec 1998, 26 (4) 248-251;
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Keywords

  • artifacts
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