Keywords:
Cardiovascular system, Cardiac, CT, Diagnostic procedure, Ischaemia / Infarction, Arteriosclerosis
Authors:
M. Williams1, S. Golay1, N. Weir1, S. Mirsadraee1, E. J. R. Van Beek1, J. Reid2, G. McKillop1, N. Uren1, D. E. Newby1; 1Edinburgh/UK, 2Melrose, Roxburghshire/UK
DOI:
10.1594/ecr2013/B-0373
Purpose
Computed tomography imaging can assess not just the coronary arteries but also the structure,
function,
perfusion and viability of the myocardium.
(Williams et al.,
2011) However,
radiation dose remains a major health care concern due to the increased lifetime risk of cancer (Einstein,
Henzlova,
& Rajagopalan,
2007).
Radiation dose reduction in computed tomography coronary angiography can be achieved through protocol optimisation,
patient tailored imaging and improvements in software and hardware.
Adaptive Iterative Dose Reduction 3D (AIDR3D,
Toshiba Medical Systems,
Japan) is an iterative reconstruction algorithm that has been shown to reduce image noise in phantom studies (Gervaise et al.,
2012) and maintain image quality in reduced dose computed tomography coronary angiography (Gagarina,
Irwan,
Gordina,
Fominykh,
& Sijens,
2011).
Patient tailored imaging is important to avoid non-diagnostic images or an unnecessarily high radiation dose.
Patient tailored imaging based on body mass index is widely used in computed tomography coronary angiography (Alkadhi et al.,
2008)(Hosch et al.,
2011).
However,
body mass index is not necessarily an accurate guide to thoracic attenuation due to the wide variation in body habitus and fat distribution.
In this study,
we assessed the use of iterative reconstruction (AIDR3D) and software that automatically selects tube current based on scout image attenuation (SUREexposure,
Toshiba Medical Systems,
Japan) on radiation dose and image quality in computed tomography myocardial perfusion imaging.