PATIENT SKIN DOSE MEASUREMENT IN CARDIAC CATHETERIZATION AND INTERVENTIONAL RADIOLOGY
Abstract
Objective: | To determine the skin dose received by the patients who underwent cardiac catheterization and interventional radiology.
Methods: The patient skin dose in this study was determined by radiochromic film and Dose Area Product (DAP) methods. The dose measurement was carried out in 64 adult patients who underwent the interventional radiology examinations such as transarterial oily chemo embolization (TOCE), percutaneous transhepatic biliary drainage (PTBD), neurovascular intervention/angiography and percutaneous transluminal coronary angioplasty/stent (PTCA) at King Chulalongkorn Memorial Hospital. The maximum entrance skin dose from each case was determined by scanning radiochromic film to get the maximum density area on the film. This area represented the maximum entrance dose. However, the comparison of the radiochromic film and DAP were made to assess the patient skin dose and the maximum radiation dose from each procedure.
Results: The maximum skin dose from transarterial oily chemo embolization (TOCE) was 365 cGy, percutaneous transhepatic biliary drainage (PTBD) was 183 cGy, percutaneous transluminal coronary angioplasty/stent (PTCA) was 294 cGy, neurovascular interventional was 180 cGy and neurovascular angiography was 110 cGy. The patient skin dose in these studies depend on the length of fluoroscopy time and only one patient who reached the threshold dose of skin injury of 300 cGy. The maximum skin dose assessment from radiochromic film was compared with DAP calculation and showed the agreement, but radiochromic film showed higher radiation dose, because the calculated dose from DAP was the accumulated skin dose at different area and it was not the point entrance area of the patient.
Conclusions: There was only 1 incident where maximum skin dose exceeded the threshold dose for temporary epilation. The determination of the radiation dose in interventional radiology and cardiac catheterization is a benefit for the prevention of radiation skin injury and also increase the awareness of the radiologist and cardiologist in using the radiation for interventional procedures.
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