Title

ACR testing of a dedicated head SPECT unit

Authors

Authors

W. F. Sensakovic; M. C. Hough;E. A. Kimbley

Comments

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Abbreviated Journal Title

J. Appl. Clin. Med. Phys

Keywords

image quality; SPECT; image perception; Radiology, Nuclear Medicine & Medical Imaging

Abstract

Physics testing necessary for program accreditation is rigorously defined by the ACR. This testing is easily applied to most conventional SPECT systems based on gamma camera technology. The inSPira HD is a dedicated head SPECT system based on a rotating dual clamshell design that acquires data in a dual-spiral geometry. The unique geometry and configuration force alterations of the standard ACR physics testing protocol. Various tests, such as intrinsic planar uniformity and/or resolution, do not apply. The Data Spectrum Deluxe Phantom used for conventional SPECT testing cannot fit in the inSPira HD scanner bore, making (currently) unapproved use of the Small Deluxe SPECT Phantom necessary. Matrix size, collimator type, scanning time, reconstruction method, and attenuation correction were all varied from the typically prescribed ACR instructions. Visible spheres, sphere contrast, visible rod groups, uniformity, and root mean square (RMS) noise were measured. The acquired SPECT images surpassed the minimum ACR requirements for both spatial resolution (9.5 mm spheres resolved) and contrast (6.4 mm rod groups resolved). Sphere contrast was generally high. Integral uniformity was 4% and RMS noise was 1.7%. Noise appeared more correlated than in images from a conventional SPECT scanner. Attenuation-corrected images produced from direct CT scanning of the phantom and a manufacturer supplied model of the phantom demonstrated negligible differences.

Journal Title

Journal of Applied Clinical Medical Physics

Volume

15

Issue/Number

4

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

372

Last Page

381

WOS Identifier

WOS:000339328400033

ISSN

1526-9914

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