TY - JOUR
T1 - Technical optimization of spiral CT for depiction of renal artery stenosis
T2 - In vitro analysis
AU - Brink, James A.
AU - Lim, John T.
AU - Wang, Ge
AU - Heiken, Jay P.
AU - Deyoe, Lane A.
AU - Vannier, Michael W.
PY - 1995/1
Y1 - 1995/1
N2 - PURPOSE: To determine empirically the effect of scan parameters and postprocessing techniques on depiction accuracy of renal artery stenosis with spiral computed tomographic angiography. MATERIALS AND METHODS: Critical (85%) and noncritical (45%) stenoses in the coronal plane were modeled in vitro and scanned with 12 combinations of collimation (1, 2, or 3 mm), table increment (pitch = 1-2), and reconstruction interval (0.5 or 1.0 mm). Five test images were generated for each spiral scanning technique: multiplanar reformation (MPR), maximum-intensity projections (MIPs: coronal MIP [MIPcor], coronal MIP targeted to phantom vessel and surrounding fat [target MIPcor], transaxial imaging, and transaxial MIP. RESULTS: With 3-mm collimation, critical stenosis was overestimated to the point of occlusion on MIPcor images and underestimated on MPR and target MIPcor images. A 0.5-mm reconstruction interval was marginally beneficial for 1- and 2-mm collimation, but noise was prohibitive with 1-mm collimation. CONCLUSION: Critical renal artery stenosis is best depicted with 2-mm collimation, 2-4- mm tablet increment, and 1-mm reconstruction interval.
AB - PURPOSE: To determine empirically the effect of scan parameters and postprocessing techniques on depiction accuracy of renal artery stenosis with spiral computed tomographic angiography. MATERIALS AND METHODS: Critical (85%) and noncritical (45%) stenoses in the coronal plane were modeled in vitro and scanned with 12 combinations of collimation (1, 2, or 3 mm), table increment (pitch = 1-2), and reconstruction interval (0.5 or 1.0 mm). Five test images were generated for each spiral scanning technique: multiplanar reformation (MPR), maximum-intensity projections (MIPs: coronal MIP [MIPcor], coronal MIP targeted to phantom vessel and surrounding fat [target MIPcor], transaxial imaging, and transaxial MIP. RESULTS: With 3-mm collimation, critical stenosis was overestimated to the point of occlusion on MIPcor images and underestimated on MPR and target MIPcor images. A 0.5-mm reconstruction interval was marginally beneficial for 1- and 2-mm collimation, but noise was prohibitive with 1-mm collimation. CONCLUSION: Critical renal artery stenosis is best depicted with 2-mm collimation, 2-4- mm tablet increment, and 1-mm reconstruction interval.
KW - Computed tomography (CT), helical
KW - Renal arteries, stenosis or obstruction
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U2 - 10.1148/radiology.194.1.7997544
DO - 10.1148/radiology.194.1.7997544
M3 - Article
C2 - 7997544
AN - SCOPUS:0028924797
SN - 0033-8419
VL - 194
SP - 157
EP - 163
JO - Radiology
JF - Radiology
IS - 1
ER -