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Meetings » 5th CTUG Meeting » A comparison of radiation dose in multi slice CT coronary angiography and conventional coronary angiography
A comparison of radiation dose in multi slice CT coronary angiography and conventional coronary angiography
Negus, I1; Smail, M1; Coles, D2; Wilde, P3; Baumbach, A4; Karsch, K4; Oberhoff M4
1 Department of Medical Physics and Bioengineering, UBHT, Bristol
2 Bristol Heart Institute
3 Department of Radiology, UBHT, Bristol
4 Department of Cardiology, UBHT, Bristol
Abstract
Developments in technology have made CT a viable modality for cardiac imaging. A group in Bristol is clinically comparing MSCT Coronary Angiography with conventional coronary angiography carried out using an image intensifier. This presentation compares the effective dose delivered by each modality for diagnostic procedures during the pilot phase of this study.
Effective doses from CT scans of individual patients were estimated from Dose Length Product data. These were compared to estimations using the ImPACT Patient Dosimetry Calculator/NRPB SR250 and with other published data. Doses from calcium scoring scans of the same patients were also estimated.
Effective doses were also estimated for pilot phase patients whose conventional coronary angiogram had been purely diagnostic and for whom a study report was available. The projection and exposure factors from the study report were used to calculate effective doses for each view using the Monte Carlo package PCXMC. This allowed a comparison of doses between the two techniques.
The potential for optimisation of CT exposure factors has also been considered. This work is ongoing.