RADIATION EXPOSURE TO PATIENTS AND CARDIOLOGISTS IN INTERVENTIONAL CARDIOLOGY

Presenter	:	YING CHEE KEAT
E-mail	:	-
Date	:	15 / 10 / 2009
Time	:	10.00 AM
Venue	:	MAKMAL KOMPUTER (NO. 269), ARAS 2, PUSAT PENGAJIAN SAINS FIZIK
Sypnosis	:	Interventional cardiology (IC) procedures are known to give high radiation doses to patients and cardiologists as they involve long fluoroscopy time. The objective of the study was to determine the dose received by patients and cardiologists during interventional cardiology procedures, such as coronary angiography (CA), percutaneous transluminal coronary angioplasty (PTCA) and CA+PTCA. Patients and cardiologists dose measurements were carried out at the cardiology department at the Gleneagles Medical Centre (GMC, Penang, Malaysia). Kodak EDR2 films and Gafchromic XR-RV2 films were placed on the table underneath the patient for an under table tube position when measuring patients’ maximum entrance skin doses (MESD). Values of 35.38 – 2442.7 mGy for MESD and 10.9 – 344.4 Gy cm2 for dose area product (DAP) were found. A good correlation was found (R2= 0.8212) and (R2= 0.7344) between the MESD and DAP values for the CA and CA+PTCA procedures respectively, but DAP was found to be poor indicator of MESD for PTCA procedure. Effective dose for cardiologists were measured using Thermoluminescent dosimeters (TLDs) placed inside the TLD holder and then placed at the cardiologist over the thyroid collar for 2 consecutive months. The TLD measured the dose at 10mm below the skin [Hp(10)]. The estimation of Hp(10), mean effective dose per DAP index value (E/DAP), mean effective dose value per procedure (E/procedure) and annual maximum effective dose were obtained. The estimated annual dose among four cardiologists of 0.11 – 0.44 mSv is well below the dose limits proposed by the International Commission on Radiological Protection (ICRP).

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