Gamma | SPECT/CT에서 CT감쇠보정에 따른 영상의 질 평가

서울대학교병원 핵의학과

조성욱⋅김계환⋅성용준⋅이형진⋅김진의

Evaluation of Image Quality Using CT Attenuation Correction

in SPECT/CT

Sung Wook Cho, Gye Hwan Kim, Yong Joon Sung, Hyung Jin Lee and Jin Eui Kim

Department of Nuclear Medicine, Seoul National University Hospital, Seoul, Korea

Purpose:

SPECT/CT, a combination of SPECT and CT, is capable of expressing the results of

attenuation correction on images biased by automatic program. As a result, this

research evaluates the usefulness of images with CT attenuation correction, using

various phantoms and images of patients.

Materials and Methods:

From July of 2012 to September of 2012, this research was conducted on the

contrast, spatial resolution, and images of patients. We studied the contrast with

IEC body phantom and Jaszczak phantom, while the spatial resolution was

evaluated with NEMA triple line phantom. Further, a comparative study was carried

out on the quality of the images, on the difference between the images before and

after the CT attenuation correction.

Results:

Compared the differences between the contrast before and after the CT attenuation

correction in IEC body phantom. The contrast was improved by 33.6% at minimum,

89.8% at maximum. In case of Jaszczak Phantom, the contrast was enhanced by

9.9% at minimum, 27.8% at maximum. In NEMA Triple line phantom, the resolution

was raised by 4.5% in average: 4.4% in horizontal, 4.5% in vertical.

In Anthropomorphic Torso Phantom, the perfusion score of the interior wall with

the most severe attenuation was measured to be 29.4%.

In the experiment carried out on myocardial perfusion SPECT/CT patients, 9%

improvement was discovered in the interior wall, where the most dramatic

attenuation occurred, after the CT attenuation correction.

Conclusion:

SPECT/CT proved its clinical usefulness by enabling the acquisition of images with

enhanced contrast and spatial resolution compare to the ones resulted from

SPECT. (Korean J Nucl Med Technol 2013;17(2):78-83)

Key Words : SPECT/CT, CT Attenuation Correction