Effect of Thin Overlapping Reconstruction on the Attenuation of Small (< or = 3 cm) Renal Cysts in the Nephrographic Phase of MDCT: a Phantom Study
Korean Journal of Radiology
;
: 275-280, 2006.
Article
in English
| WPRIM
| ID: wpr-91960
ABSTRACT
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 ANDMETHODS:
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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Iohexol
/
Radiographic Image Interpretation, Computer-Assisted
/
Tomography, X-Ray Computed
/
Phantoms, Imaging
/
Contrast Media
/
Kidney Diseases, Cystic
Limits:
Humans
Language:
English
Journal:
Korean Journal of Radiology
Year:
2006
Type:
Article
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