Van der Vlugt-Meijer Roselinda H, Meij Björn P, Voorhout George
Division of Diagnostic Imaging, Faculty of Veterinary Medicine, Utrecht University, The Netherlands.
Vet Radiol Ultrasound. 2007 Mar-Apr;48(2):118-24. doi: 10.1111/j.1740-8261.2007.00215.x.
Dynamic helical computed tomography (CT) of the pituitary gland can be used to image the three-dimensional shape and dimensions of abnormalities within the pituitary gland. The aim of this study was to develop a protocol for dynamic helical CT of the pituitary gland in healthy dogs as a future reference study for patients with pituitary disease. Dynamic helical series of nine scans of the pituitary gland during and following contrast medium injection were performed in six healthy dogs using the following protocols: a series with 1 mm collimation and a table feed per X-ray tube rotation of 2 mm (pitch of 2) in six dogs, a series with 2 mm collimation and pitch of 2 in three dogs, and a series with 1 mm collimation and pitch of 1 in three other dogs. Multiplanar reconstructions of the images were made using a reconstruction index of 0.5. Images of all series were assessed visually for enhancement of the arteries, the neurohypophysis, and the adenohypophysis. The enhancement pattern of the neurohypophysis was distinguished adequately from that of the adenohypophysis in five dogs that were scanned with 1 mm collimation and pitch of 2, but the difference was less discernable when the other protocols were used. The carotid artery, its trifurcation, and the arterial cerebral circle were best visualized in dorsal reconstructions. Dynamic helical CT of the pituitary gland in healthy dogs can be performed with 1 mm collimation and pitch of 2, and a scan length that includes the entire pituitary region. Using this protocol, with the specific scanner used, the neurohypophysis, the adenohypophysis, and the surrounding vascular structures are adequately visualized.
垂体动态螺旋计算机断层扫描（CT）可用于成像垂体内部异常的三维形状和尺寸。本研究的目的是制定健康犬垂体动态螺旋CT的方案，作为垂体疾病患者未来的参考研究。使用以下方案对6只健康犬在注射造影剂期间及之后进行垂体的9次动态螺旋扫描：6只犬采用1毫米准直和每X射线管旋转2毫米的床速（螺距为2）的扫描系列，3只犬采用2毫米准直和螺距为2的扫描系列，另外3只犬采用1毫米准直和螺距为1的扫描系列。使用0.5的重建指数对图像进行多平面重建。对所有系列的图像进行视觉评估，观察动脉、神经垂体和腺垂体的强化情况。在5只采用1毫米准直和螺距为2进行扫描的犬中，神经垂体的强化模式与腺垂体的强化模式能够充分区分，但使用其他方案时，差异不太明显。在背侧重建中，颈动脉及其分支和脑动脉环显示最佳。健康犬垂体的动态螺旋CT可以采用1毫米准直和螺距为2以及包括整个垂体区域的扫描长度来进行。使用该方案以及所使用的特定扫描仪，可以充分显示神经垂体、腺垂体和周围血管结构。
