Al-Ogaili Zeyad, Reed Anita J, Burrage John
Fiona Stanley Hospital, Murdoch, Western Australia, Australia.
J Med Imaging Radiat Oncol. 2018 Oct;62(5):662-664. doi: 10.1111/1754-9485.12729. Epub 2018 Apr 14.
The reduced (attenuated) number of photons passing through the arm can result in a combination of fine and thick streak artefacts, particularly with the use of thin CT slices and lower radiation dose parameters. This phenomenon is known as photon starvation. We noted an abnormal appearance of the humerus when imaged with certain arm position. This appearance was thought to be artefact due to photon starvation.
A human radius bone was imaged in different positions and the kV and mA were varied in an attempt to reproduce the artefact, which would support the hypothesis that the artefact may be caused by bone attenuation.
Scanning the bone in a different angle and radiation dose parameters reproduced the artefactual appearance of the bone.
Performing a chest CT scan with arms up can occasionally result in an abnormal appearance to the humerus due to photon starvation artefact. Familiarity with this artefact is essential to avoid misinterpretation.
穿过手臂的光子数量减少（衰减）会导致细条纹和粗条纹伪影同时出现，尤其是在使用薄层CT扫描和较低辐射剂量参数时。这种现象被称为光子饥饿。我们注意到，当以特定手臂位置进行成像时，肱骨会出现异常外观。这种外观被认为是由光子饥饿导致的伪影。
对一根人体桡骨在不同位置进行成像，并改变千伏（kV）和毫安（mA），试图重现该伪影，这将支持伪影可能由骨骼衰减引起的假设。
以不同角度和辐射剂量参数扫描骨骼，重现了骨骼的伪影外观。
双臂上举进行胸部CT扫描时，偶尔会因光子饥饿伪影导致肱骨出现异常外观。熟悉这种伪影对于避免误诊至关重要。
