[Evaluation of the X-ray exposure dosage during coronary cineangiography].

PURPOSE

To study the radiation doses during cardiac catheterization.

PATIENTS AND METHODS

Thermoluminescents dosimeters were placed over a phantom's cardiac area, measuring both entrance and exit of the X-ray beam to check the absorbed dose. We could measure the doses in the examiner with dosimeters in frontal and hand's back regions.

RESULTS

The average rate of exposure in the cinefilmstep increases in the 5.2 times the average rate measured in the fluoroscopy mode. The dose absorbed by the patient was of 114 mGy during a total of 20 min X-ray exposure time (e.g. 15 min of fluoroscopy and 1 min of film). Compared to the results obtained with the phantom's dose we have found a relative error of 20. Under the same exposure time we wave found a 0.68 mSv dose in the examiner's hands and a 0.40 mSv dose in his eyes.

CONCLUSION

In this kind of procedure the examiner should have special concern as to observe the appropriate technical conditions besides having to make use of individual protection devices to minimize the radiation doses on his own behalf and behalf of his patient.