RT Journal Article
SR Electronic
T1 Adjustment of Overestimated CT-Based Attenuation Correction on Bone SPECT/CT After Hip-Resurfacing Arthroplasty
JF Journal of Nuclear Medicine Technology
JO J. Nucl. Med. Technol.
FD Society of Nuclear Medicine
SP 203
OP 207
DO 10.2967/jnmt.113.121152
VO 41
IS 3
A1 Suzuki, Akira
A1 Koshida, Kichiro
A1 Matsubara, Kosuke
YR 2013
UL http://tech.snmjournals.org/content/41/3/203.abstract
AB SPECT/CT has made it possible to perform attenuation correction easily. However, CT-based attenuation correction (CTAC) is overestimated when metal is inside the body. The aim of this investigation was to create and test a new attenuation correction formula for CTAC that decreases the overestimation caused by an artificial femoral head and hip joint. Methods: We tested the usefulness of the new formula in a phantom study. The phantom contained “bones” made from gypsum. The components were placed in the phantom, the point source was placed both near metal and away from metal, and the counts were compared to verify the usefulness of the new attenuation correction formula. The new formula included use of thresholds to prevent the overestimation caused by proximity to metal. Results: With the standard formula, the maximum overestimation was 18% for a 22-cm artificial hip joint placed in the acetabular roof. With the new formula, using 2 thresholds, the overestimation decreased to 4%. Conclusion: The new attenuation correction formula helps provide more correct data in SPECT/CT examinations of patients with metallic implants.