Dose reduction for body composition measurements with CT.
The purpose was to obtain reliable measures of fat and muscle tissue areas with CT at a reduced radiation dose level. Repeated CT-scans with four different levels of reduced radiation dose were perfomed on a water phantom and a volunteer at the L4-L5 level. Dose measurements were performed in a phantom and free in air. A histogram model function for fat, muscle and partial volume affected voxels was proposed and used in the analysis of image noise. The result was at most a 25-fold reduction in radiation dose with an image noise of 40 HU but only a minor influence on the tissue area determination [corrected].
Starck
G
G
Division of Medical Physics and Medical Engineering, Sahlgrenska University Hospital, Göteborg, Sweden.
Lönn
L
L
Cederblad
A
A
Alpsten
M
M
Sjöström
L
L
Ekholm
S
S
D000328:Adult; D001823:Body Composition; D015992:Body Mass Index; D006801:Humans; D008297:Male; D012016:Reference Values; D012044:Regression Analysis; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed / Q000379:methods*