Cohnen M, Cohnen B, Ewen K, Teubert G, Mödder U
Institut f. Diagnostische Radiologie, Universität Düsseldorf.
Rofo. 1998 May;168(5):474-9. doi: 10.1055/s-2007-1015164.
In view of the increasing frequency of computed tomographic examinations the organ doses of the thyroid gland and the eye lenses in spiral CT examinations of the head and neck should be determined.
Standard CT-examinations of the neck, the paranasal sinuses in axial and coronal sections, and the mandibula were simulated by help of an Alderson-Rando phantom. Dose measurements were performed as well in 28 patients. The examinations were carried out in spiral mode ("Somatom AR.SP", "Picker PQ 2000", and "Toshiba Xpress SX") and conventional single slice technique ("Somatom Plus"). Three LiF-TLD were placed on each eyelid and three on the thyroid.
With direct exposure to the x-ray-beam the organ doses did not exceed 64 mGy. When exposed by scatter radiation only, doses may be reduced by a factor of up to 10. The measurements in 28 patients showed similar results.
The organ doses in spiral CT correspond with data known from conventional CT.
鉴于计算机断层扫描检查的频率不断增加，应确定头颈部螺旋CT检查中甲状腺和晶状体的器官剂量。
借助Alderson-Rando体模模拟颈部、轴位和冠状位鼻窦以及下颌骨的标准CT检查。还对28例患者进行了剂量测量。检查采用螺旋模式（“Somatom AR.SP”、“Picker PQ 2000”和“Toshiba Xpress SX”）和传统单层面技术（“Somatom Plus”）进行。在每个眼睑放置3个氟化锂热释光剂量计，在甲状腺放置3个。
直接暴露于X射线束时，器官剂量不超过64毫戈瑞。仅在散射辐射照射下，剂量可降低至1/10。28例患者的测量结果显示了类似的结果。
螺旋CT中的器官剂量与传统CT已知数据相符。
