Phantom evaluation of a cardiac SPECT/VCT system that uses a common set of solid-state detectors for both emission and transmission scans

被引：32

作者：

Bai, Chuanyong ^{[1
]}

Conwell, Richard ^{[1
]}

Kindem, Joel ^{[1
]}

Babla, Hetal ^{[1
]}

Gurley, Mike ^{[1
]}

De Los Santos, Romer, II ^{[1
]}

Old, Rex ^{[1
]}

Weatherhead, Randy ^{[1
]}

Arram, Samia ^{[2
]}

Maddahi, Jamshid ^{[3
]}

机构：

[1] Digirad Corp, Poway, CA 92064 USA

[2] MD Off Solut, San Diego, CA USA

[3] Univ Calif Los Angeles, David Geffen Sch Med, Dept Mol & Med Pharmacol Nucl Med & Med Cardiol, Los Angeles, CA 90095 USA

来源：

JOURNAL OF NUCLEAR CARDIOLOGY | 2010年 / 17卷 / 03期

关键词：

Attenuation correction; Cardiac SPECT; Solid-state detector; Fluorescence x-ray transmission source; ATTENUATION CORRECTION; CT;

D O I：

10.1007/s12350-010-9204-8

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

We developed a cardiac SPECT system (X-ACT) with low dose volume CT transmission-based attenuation correction (AC). Three solid-state detectors are configured to form a triple-head system for emission scans and reconfigured to form a 69-cm field-of-view detector arc for transmission scans. A near mono-energetic transmission line source is produced from the collimated fluorescence x-ray emitted from a lead target when the target is illuminated by a narrow polychromatic x-ray beam from an x-ray tube. Transmission scans can be completed in 1 min with insignificant patient dose (deep dose equivalent < 5 mu Sv). We used phantom studies to evaluate (1) the accuracy of the reconstructed attenuation maps, (2) the effect of AC on image uniformity, and (3) the effect of AC on defect contrast (DC). The phantoms we used included an ACR phantom, an anthropomorphic phantom with a uniform cardiac insert, and an anthropomorphic phantom with two defects in the cardiac insert. The reconstructed attenuation coefficient of water at 140 keV was .150 +/- A .003/cm in the uniform region of the ACR phantom, .151 +/- A .003/cm and .151 +/- A .002/cm in the liver and cardiac regions of the anthropomorphic phantom. The ACR phantom images with AC showed correction of the bowing effect due to attenuation in the images without AC (NC). The 17-segment scores of the images of the uniform cardiac insert were 78.3 +/- A 6.5 before and 87.9 +/- A 3.3 after AC (average +/- A standard deviation). The inferior-to-anterior wall ratio and the septal-to-lateral wall ratio were .99 and 1.16 before and 1.02 and 1.00 after AC. The DC of the two defects was .528 and .156 before and .628 and .173 after AC. The X-ACT system generated accurate attenuation maps with 1-minute transmission scans. AC improved image quality and uniformity over NC.

引用

页码：459 / 469

页数：11

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