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Keywords:
Calcifications / Calculi, Blood, Imaging sequences, CT-Angiography, CT, Vascular, Contrast agents
Authors:
J. Misaka, T. Miyazaki, T. Miyamoto, Y. Itou; Tokyo/JP
DOI:
10.1594/ecr2017/C-0211
Methods and materials
• Method
Imaging using dual energy was performed in patients with ASO (31 subjects).
Eleven of these 31 subjects were patients that had been followed up,
and from this examination on,
the imaging method has been changed to the one using dual energy for them.
Each image taken this way was reconstructed into CPR,
MPR,
VR,
and MIP,
and then they were compared and examined.
Evaluation was performed visually by two radiologists and ten radiographers.
Devices used
•TOSHIBA Aquliion64
• SIEMENS SOMATOM Force
The imaging conditions were as follows:
The tube voltages were set to 80 KV and 150 KV with 400 mAs (80 KV) and 230 mAs (150 KV) respectively,
and dual energy was used.
Under the previous imaging condition for the patients who had been followed up,
the tube voltages used to be 120KV with 150mAs.
In the present study,
the imaging method was as follows:
The Test Bolus Tracking method was used for contrast radiography.
The Test Bolus Tracking method was performed for each of the abdominal aorta and the popliteal artery at one time of imaging,
and the timing at which optimum contrast effect was obtained for each was examined.
Careful attention is needed so as not to confuse blood vessels and lime when you check the peak because it is difficult to identify blood vessels in the popliteal artery due to the influence of calcification.
The time during which the contrast effect from the abdominal aorta to the popliteal artery is sustained can be examined by the Test Bolus Tracking method.
It needs to be taken into consideration that it takes time to obtain a proper imaging effect for blood vessels from the popliteal artery to the feet due to the influence of calcification.
Imaging time is considered,
based on these factors.