Keywords:
Dosimetric comparison, Radiation safety, CT-Angiography, CT, Paediatric, Cardiovascular system, Cardiac
Authors:
�. Akdulum1, E. Gürün1, G. Durukan Günaydın2, R. Beyoğlu1, �. L. Boyunağa1; 1ankara/TR, 2Istanbul/TR
DOI:
10.26044/ecr2019/C-3128
Results
The ages of the patients were between 1 day to 17 years.
24 patients have ECG-triggered cardiac CT.
The avarage of heart rate of the patients was 107 ±23,7 (SD) bpm.
The mean radiation dose (DLP) was 71.5 ±64,4 (SD) mGycm.
The mean effective radiation dose was calculated as 1.34 ±1,01 (SD) mSv.
Two techniques we used for cardiac ct; retrospective and prospective.
Retrospective technique includes all phases of cardiac cycle.
Prospective technique only allows the exposure to apply at a certain predefined period of cardiac cycle.
Therefore,
prospective technique can lower radiation dose while ensure the diagnostic images.
With high heart rate we prefer retrospective technique because the best exposure period for prospective technique may not be detected.
We used prospective technique for five patients.
This patients radiation doses statically lower from retrospective technique (p<0,05).
Technique
|
n
|
DLP
min – max (median)
|
Effective Dose (mSv)
min – max (median)
|
Prospective
|
5
|
18 – 29 (25)
|
0,38 – 0,9 (0,67)
|
Retrospective
|
19
|
17 – 235 (61)
|
0,44 – 4 (1,99)
|
Total
|
24
|
18 – 235 (71,5)
|
0,38 – 4 (1,34)
|
*Mann-Whitney U test,
p <0.05
Table 1: Minimum,
maximum and median values of prospective and retrospective technique ECG triggered cardiac CT groups
The greater group of indication for exam was preoperative coronary anatomy evaluation of tetralogy of fallot patients.
The diagnosis of seven patients were tetralogy of fallot disease.
The operation method can be change with abnormal or variational coronary anatomy.
If a major coronary artery branch crosses the infundibulum,
conventional transventricular repair may cause coronary injury.
The surgeon want to see coronary anatomy before operation (4).