S-Space College of Medicine/School of Medicine (의과대학/대학원) Radiology (영상의학전공) Journal Papers (저널논문_영상의학전공)
Effect of thin overlapping reconstruction on the attenuation of small (< or = 3 cm) renal cysts in the nephrographic phase of MDCT: a phantom study
- Kim, Sun Ho; Kim, Seung Hyup
- Issue Date
- The Korean Radiological Society
- Korean J Radiol 2006;7(4):275-80.
- Contrast Media; Iohexol/analogs & derivatives/diagnostic use; *Radiographic Image Interpretation, Computer-Assisted; Kidney; Cyst; Computed tomography; Pseudoenhancement
- RoMEO에 미등재
- OBJECTIVE: To evaluate the effect of thin overlapping reconstruction on the attenuation of small (< or =3 cm) renal cysts in the nephrographic phase of multidetector CT (MDCT). MATERIALS AND METHODS: We scanned a phantom kidney containing spheres of various sizes (10, 20, and 30 mm) using both 4- and 16-channel MDCT scanners, and reconstructed images with various slice thickness (T, mm) and intervals (I, mm). The attenuation increase (AI) was measured for each sphere in 240-HU diluted solution of contrast material and compared with the attenuation in 35-HU solution. RESULTS: On the 4-channel MDCT, thin overlapping reconstruction (T/I = 3/1, compared with 5/5) lowered the AI as much as 17 HU in the 10 mm-sphere and 6 HU in the 20 mm-sphere (p < 0.05). Thin slicing alone was also effective; however overlapping alone was not. On the 16-channel MDCT, AI in the 10 mm-sphere was significantly lower than on the 4-channel MDCT with T/I = 5/5 (p < 0.05), however thinner slicing or overlapping did not affect the attenuation significantly in all of the spheres. CONCLUSION: The effect of thin overlapping reconstruction on minimizing falsely elevated attenuation in the nephrographic phase was significant only in cysts < or = 20 mm on the 4-channel MDCT.
- 1229-6929 (Print)