Evaluation of a novel CT image reconstruction algorithm with enhanced temporal resolution

Temporal resolution and motion artifacts in single‐source and dual‐source cardiac CT

“…Two of them have been published before, namely, the TRI-PICCS algorithm proposed by Chen et al 5,13 and TRIM. 6,7 Both of them use a Parker weighted FBP image as start image and then perform a constrained (algebraic) iterative reconstruction using only a subset of the original fan-beam input data to enhance the temporal resolution of the image. In TRI-PICCS, the constraint is designed to minimize a linear combination of the TV norm of the target image and the TV norm of the difference between the target image and the Parker-weighted input image, where in line with previous literature the term "TV norm of an image" denotes the 1 -norm of the discrete gradient transform of the image in question.…”

“…5) and TRIM. 6,7 We will begin our considerations with an introduction into cardiac CT and a comprehensive review of the TR properties in conventional SSCT. From there, we will discuss the extension of these properties to DSCT.…”

Improving best‐phase image quality in cardiac CT by motion correction with MAM optimization

“…Common strategies to overcome limited data artifacts are the use of a prior image and a regularization term enforcing smoothness in TRI-PICCS 3 or a regularization term enforcing positivity in TRIM. 4 The quantification of the temporal resolution of those algorithms is difficult. Latest results suggest minor improvements for TRI-PICCS.…”

“…With the introduction of the TRIM-algorithm 4 which are caused by data inconsistencies. The intensity at a voxel minus an average predefined value T is enforced to be always positive inside the M-ROI .…”

Nonrigid registration-based coronary artery motion correction for cardiac computed tomography

“…A third reconstruction-related approach makes use of prior knowledge to reduce the reliance on data that is far from the phase of interest. 11,12 Finally, methods that use drugs (e.g., β-blockers) to lower the heart rate cannot always reduce it to lie within manageable imaging ranges 13 and preclude segments of the target population presenting asthma, contraindications to the drug, or pregnancy. 14 Given the challenges described above, estimating and explicitly compensating for motion as part of the reconstruction algorithm is a promising, cost effective way to robustly provide diagnostic images of the coronary arteries.…”