Type:
Educational Exhibit
Keywords:
Education and training, Education, CT-High Resolution, CT-Angiography, CNS
Authors:
M. Gomyo1, K. Tsuchiya2, H. Machida1, S. Katase1, A. Ohara1, H. Tateishi1, H. Shiga1, M. Koyanagi1, K. Yokoyama1; 1Tokyo/JP, 2Kawagoe City, Saitama/JP
DOI:
10.1594/ecr2018/C-1135
Background
Although precise depiction of the perforating arteries is required in making strategies for direct surgery and stroke management,
capability of conventional CT has been limited due to limited spatial resolution. The latest ultra-high-resolution CT (UHRCT) scanner (Aquilion Precision™; Toshiba Medical Systems,
Tokyo,
Japan) provides slice collimation of 0.25 mm x 160 and matrix size of 1024 x 1024 or 2048 x 2048.
Major features of this CT scanner include an improved detector system (the minimal slice thickness,
0.25 mm; the maximal channel number,
1792) and a small x-ray focus (the smallest size,
0.4 x 0.5 mm) compared to a conventional multi-detector CT (MDCT) scanner (the minimal slice thickness,
0.5 mm; the maximal channel number,
896; the smallest x-ray focus size,
0.8 x 0.9 mm) (Fig.
1).
UHRCT has recently become available for clinical testing in order to improve spatial resolution enabling robust depiction of cortical branches of the main arteries and critical perforating arteries by brain CTA,
compared to conventional MDCT (Figs.
2,
3).
In this exhibit,
we show the anatomical and clinical significance of intracranial cortical branches and perforating arteries which were difficult to visualize with conventional MDCT but are now visualized by using the UHRCT.