ESTRO 2024 - Abstract Book

S3887

Physics - Image acquisition and processing

ESTRO 2024

Results:

In the phantom experiments, the measured T1 generally increases with the ground truth T1 for each of the tubes with measurements underestimating T1 as T1 increases (Figure 1a). With the ICD present, the tube closest to the ICD (T1 = 1052ms) showed the largest decreases in measured T1. Figure 1b shows banding artefacts on the bSSFP scans in the tubes closest to the ICD. These artefacts are not seen on the spoiled GE.

Images from a single slice in the volunteer scan are shown in Figure 2a. The appearance of the images without the ICD in place demonstrate a reduction in signal-to-noise ratio (SNR) in the spoiled GE as compared to the bSSFP. With the ICD present, prominent artefacts are seen in the bSSFP image (arrows), obscuring the cardiac anatomy. The artefact is not observed in the spoiled GE sequence. The change in calculated mean myocardial T1 owing to the presence of the ICD was larger in the bSSFP (+15%) compared to the spoiled GE (-2%). The mean calculated T1 by segment is shown in Figure 2b, with the segment divisions indicated in Figure 2a. The largest change in calculated T1 was in the anteroseptal segment, the closest region to the location of the ICD, with a change of +22% in the bSSFP and -31% in the spoiled GE.