الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 171 |  |  |
| | | from | 171 | | |
Abstract
Coronary anomalies are often asymptomatic and may be accidentally discovered. With the increase of interventional coronary procedures, the detection of coronary anomalies is becoming of major clinical importance, the coronary anomalies cannot be considered just rare aspects because they may often lead to relevant clinical consequences.
That is reason why the diagnosis of coronary anomalies should be a healthcare priority. Various imaging modalities are available for coronary artery assessment. With the advent of newer generations of CT scanners, the 128-slice MDCT , and more recently, the dual-source CT (DSCT), temporal and spatial resolution have improved dramatically, due to a higher gantry rotation speed. Consequently, image quality has improved and the number of motion artifacts have substantially decreased compared to earlier scanner generations.
As a result of these developments, evaluation of the coronary artery tree is increasingly performed with CT. In MDCT, the coronary anatomy is shown in axial slices, as in all other radiological studies. But besides these axial slices, coronary anatomy can also be evaluated using a three-dimensional visualization derived from these axial slices. With current software, oblique multiplanar reconstructions, curved multiplanar reconstructions, three- and four-dimensional volume rendering can be achieved without extensive manual manipulation necessary. Excellent image acquisition required a normal resting sinus rhythm with a targeted rate of less than 65 beats per minute during the scan. Cardiac motion with higher diastolic interval was desirable for acquisition of nearly motion free images. This was achieved by administering beta blocker agent 2 hours before the examination.
Using a 128-MDCT with low dose protocol and prospective ECG-gating provides higher image quality with significant lower radiation doses.