Use of a Knowledge-based Iterative Reconstruction Technique, IMR, to Improve Image Quality and Lower Radiation Dose

Abstract

Use of IMR in Clinical Practice IMR is used in a variety of ways in our practice. Since our department has already reduced radiation dose as part of standard practice, we use IMR to improve the image quality at a given radiation dose. [...]we use IMR for CT angiography (CTA) examinations that require high contrast and high spatial resolution; in these cases, IMR is useful to reduce section thickness and lower noise (Case 5). Because IMR images are virtually noise free, they appear different from iDose4 images. [...]in the initial stages, reviewing images side-by-side with both reconstruction techniques may help to achieve familiarity with the new technique. The dissection flap (red arrow) is also more sharply delineated from the surrounding true and false lumen on the IMR image (C). [...]using the same CT examination, but 2 different processing techniques, it is apparent that with IMR, there is better contrast resolution between the lesion and the surrounding parenchyma, improving the sensitivity for lesion detection and providing better visualization of the abnormality, compared to iDose4.