Supervisors info:
Εμμανουήλ Παπαναστασίου, Επίκουρος Καθηγητής, Ιατρική Σχολή, ΑΠΘ
Αναστάσιος Σιούντας, Ομ. Καθηγητής, Ιατρική Σχολή, ΑΠΘ
Στέφανος Φοινίτσης, Επίκουρος Καθηγητής, Ιατρική Σχολή, ΑΠΘ
Summary:
The purpose of the present study is to investigate the contribution of three-dimensional imaging (CBCT) to the total dose received by the patient in interventional radiology procedures involving the head region.
For the above purpose, 44 cases of cerebral angiography and 12 brain embolization with coil were recorded that were performed at the angiographer of the AHEPA General University Hospital during the period September 2021 – May 2022. In each case, patient characteristics were noted (height, weight, age & sheet), which of the three available interventionalists undertook the event, baseline values calculated by all angiographic systems and used to establish DRLs (DAP, Ka,r, fluoroscopy time and number of frames) and, for CBCT acquisitions, the number of them in each procedure, their type, DAP and Ka,r were noted. Furthermore, using the Dose Tracking System available to the specific angiographer, the maximum skin dose (PSD) was recorded for 33 of the 45 cases of panangiography and 9 of the 12 cases of brain embolization. Finally, for 15 of the 45 cerebral angiography cases, the Field Of View, Focus to Intensifier Distance or Focus to Rotation point Distance sizes, the head/neck area that was irradiated, kV and filters used (materials & thicknesses) for each digital acquisition made in each procedure were noted in order for this data to be entered into the PCXMC 2.0 program.
From the statistical processing of the above quantities, the percentages of DAP and Ka,r derived from each imaging mode (fluoroscopy and DSA-BIPLANE, CBCT belonging to the digital acquisition) were calculated for the two types of procedures. The existing local DRLs in cerebrel angiography were revised for the AHEPA hospital, organ doses were calculated from the digital acquisition, using PCXMC, and equations were found for the direct estimation of PSD and Effective Dose from Ka,r and DAP respectively. It was investigated which factors affect the dose (physician experience, BMI), both the total and that coming from each CBCT acquisition, which was analyzed statistically and, finally, the dose coming from each type of CBCT acquisition was calculated.
Keywords:
Angiographer, Cone Beam Computed Tomography, Cerabral angiography, Brain Embolization, PCXMC 2.0
