Huxohl Tamino, Patel Gopesh, Burchert Wolfgang
Institute of Radiology, Nuclear Medicine and Molecular Imaging, Heart and Diabetes Center North Rhine-Westphalia, University Hospital (Ruhr University Bochum), Medical Faculty OWL (Bielefeld University), Bad Oeynhausen, Germany.
EJNMMI Phys. 2025 Jan 20;12(1):3. doi: 10.1186/s40658-024-00713-4.
The topic of the effect of the patient table on attenuation in myocardial perfusion imaging (MPI) SPECT is gaining new relevance due to deep learning methods. Existing studies on this effect are old, rare and only consider phantom measurements, not patient studies. This study investigates the effect of the patient table on attenuation based on the difference between reconstructions of phantom scans and polar maps of patient studies.
Jaszczak phantom scans are acquired according to quality control and MPI procedures. An algorithm is developed to automatically remove the patient table from the CT for attenuation correction. The scans are then reconstructed with attenuation correction either with or without the patient table in the CT. The reconstructions are compared qualitatively and on the basis of their percentage difference. In addition, a small retrospective cohort of 15 patients is examined by comparing the resulting polar maps. Polar maps are compared qualitatively and based on the segment perfusion scores.
The phantom reconstructions look qualitatively similar in both the quality control and MPI procedures. The percentage difference is highest in the lower part of the phantom, but it always remains below 17.5%. Polar maps from patient studies also look qualitatively similar. Furthermore, the segment scores are not significantly different (p=0.83).
The effect of the patient table on attenuation in MPI SPECT is negligible.
由于深度学习方法，患者检查床对心肌灌注成像（MPI）单光子发射计算机断层扫描（SPECT）中衰减的影响这一话题正变得越来越重要。现有的关于这种影响的研究年代久远、数量稀少，并且仅考虑了模体测量，而非患者研究。本研究基于模体扫描重建与患者研究极坐标图之间的差异，调查患者检查床对衰减的影响。
根据质量控制和MPI程序获取Jaszczak模体扫描图像。开发了一种算法，用于在CT图像中自动去除患者检查床以进行衰减校正。然后对扫描图像进行重建，在CT图像中有或没有患者检查床的情况下进行衰减校正。对重建图像进行定性比较，并基于它们的百分比差异进行比较。此外，通过比较15例患者的极坐标图，对一个小型回顾性队列进行研究。对极坐标图进行定性比较，并基于节段灌注评分进行比较。
在质量控制和MPI程序中，模体重建在定性上看起来相似。百分比差异在模体下部最高，但始终保持在17.5%以下。患者研究的极坐标图在定性上也看起来相似。此外，节段评分没有显著差异（p = 0.83）。
患者检查床对MPI SPECT中衰减的影响可以忽略不计。
