Lang Norbert, Dawood Mohammad, Büther Florian, Schober Otmar, Schäfers Michael, Schäfers Klaus
Department of Nuclear Medicine, University Hospital of Münster, Germany.
Z Med Phys. 2006;16(1):93-100. doi: 10.1078/0939-3889-00296.
Imaging of moving organs using the PET leads to blurred images due to long acquisition times. Simultaneous cardiac and respiratory gating of list-mode PET/CT is evaluated with the aim to improve image quality and assess the organ movement.
We performed a N-13 ammonia PET/CT scan with a human volunteer, using the Siemens Biograph Sensation 16 scanner with list-mode acquisition. For ECG gating we used the scanner's integrated ECG device. Respiratory gating was done with the BioVet pneumatic sensor system.
The sorting of the list-mode data post acquisition produced the desired matrix of eight cardiac times eight respiratory images. Organ movement could be measured in the series of gated PET images. The quantitation of tracer uptake in the myocardium showed artifacts due to the CT-based attenuation correction.
Double gating is feasible in human PET/CT scans using a list-mode-based scan protocol. The image quality can be enhanced using double gated list-mode acquisition in PET/CT Attenuation correction protocols in PET using a single not gated fast CT introduces artifacts in moving organs.
由于采集时间长，使用正电子发射断层扫描（PET）对运动器官进行成像会导致图像模糊。评估列表模式PET/CT的同步心脏和呼吸门控，旨在提高图像质量并评估器官运动。
我们使用西门子Biograph Sensation 16扫描仪对一名人类志愿者进行了N-13氨PET/CT扫描，采用列表模式采集。对于心电图门控，我们使用了扫描仪的集成心电图设备。呼吸门控通过BioVet气动传感器系统完成。
采集后对列表模式数据进行分类产生了所需的8个心脏期乘以8个呼吸图像的矩阵。在一系列门控PET图像中可以测量器官运动。由于基于CT的衰减校正，心肌中示踪剂摄取的定量显示出伪影。
在基于列表模式的扫描协议的人体PET/CT扫描中，双门控是可行的。在PET/CT中使用双门控列表模式采集可以提高图像质量。在PET中使用单个非门控快速CT的衰减校正协议会在运动器官中引入伪影。
