Unit:
Κατεύθυνση Ιατρική Φυσική-ΑκτινοφυσικήLibrary of the School of Health Sciences
Author:
Tzanis Eleftherios
Supervisors info:
Ιωάννης Δαμηλάκης - Καθηγητής, Ιατρική Σχολή, Πανεπιστήμιο Κρήτης
Κωνσταντίνος Περισυνάκης - Αναπληρωτής Καθηγητής, Ιατρική Σχολή, Πανεπιστήμιο Κρήτης
Μιχάλης Μαζωνάκης - Επίκουρος Καθηγητής, Ιατρική Σχολή, Πανεπιστήμιο Κρήτης
Original Title:
Έκθεση επαγγελματικά εκτιθέμενων σε ακτινοβολία από εξετάσεις διαδερμικής ενδοαυλικής αγγειοπλαστικής και ενδαγγειακής αποκατάστασης ανευρύσματος
Translated title:
Occupational radiation doses to operatots performing percutaneous transluminal angioplasty (PTA) and endovascular aortic repair (EVAR)
Summary:
In recent years the number of fluoroscopically guided procedures has grown rapidly [20]. According to the National Council on Radiation Protection and Measurements, approximately 17 million fluoroscopically guided procedures were performed in 2006. As reported by Bhargavan 2008 [21], there is an 8.5% annual increase of fluoroscopically guided procedures. The largest increases were reported for cardiac procedures and spinal procedures.
Interventionalists are exposed to scattered radiation. Although the radiation doses are low, the problem that arises is that the interventionalists exposure is repeated for a long term period. According to the International Commission on Radiation Protection (ICRP), “particular attention should be paid to radiation effects in the lens of the eye and on the cardiovascular system, because of recent published observations of radiation effects in these systems occurring at much lower doses than reported previously”. Furthermore, exposure in chronic low dose radiation, can cause stochastic and deterministic effects concerning the brain [22].
The purposes of this study were :
• Determination of the dose received by the interventionalists during the fluoroscopically guided procedures. In particular, measurements were performed for the following types of procedures : Percutaneous transluminal angioplasty (PTA - 36 cases), endovascular aneurysm repair (EVAR – 17 cases). In order to determine the dose, we used thermoluminescence dosimeters (TLD – 200). The effective dose was calculated using the Niklason method. Taking under consideration the annual workload, the maximum annual effective dose was estimated.
• Determination of the occupational dose reduction, due to the use of personal radiation protection equipment. Using anthropomorphic phantoms we managed to create a simulation of the procedures. We placed dosimeters over and under the radiation protection equipment in order to determine the reduction of the dose.
• Determination of the occupational dose reduction, due to the use of a radioprotective drape.
• Determination of the occupation dose increase and patient dose increase due to the entry of the radioprotective drape into the field.
Determining the absorbed dose is of the utmost importance. It is a quantity directly linked to the stochastic effects. Furthermore, its knowledge is necessary to optimize and evaluate the applied techniques.
Main subject category:
Physics
Keywords:
Occupational dose. fluoroscopically guided procedures, radiation protection equipment
