Discipline of Oral and Maxillofacial Radiology, Faculty of Dentistry, University of Toronto, 124 Edward Street, Toronto, Ontario M5G 1G6, Canada.
Dentomaxillofac Radiol. 2010 Jul;39(5):257-63. doi: 10.1259/dmfr/62878962.
As a first step in developing a protocol for multidimensional sialography using cone beam CT (CBCT), the objective of this study was to compare the effective radiation doses from sialography of the parotid and submandibular glands using plain radiography and CBCT.
The effective doses were calculated from dose measurements made at 25 selected locations in the head and neck of a radiation analogue dosimeter (RANDO) phantom, using International Commission on Radiological Protection 2007 tissue weighting factors.
The effective dose (E) changed in relationship to changes in CBCT field of view (FOV), peak kilovoltage (kVp) and milliamperage (mA). Specifically, E decreased from a maximum of 932 microSv (30 cm FOV, 120 kVp, 15 mA) to 60 microSv (15 cm FOV, 80 kVp, 10 mA) for a parotid gland study and to 148 microSv (15 cm FOV, 80 kVp, 10 mA) for a submandibular study. The collective series of plain radiographs made during sialography of the parotid and submandibular glands yielded effective doses of 65 microSv and 156 microSv, respectively. The plain parotid gland series included one panoramic, two anterior-posterior skull and four lateral skull radiographs, whereas the submandibular gland series included one panoramic, one standard mandibular occlusal and four lateral skull radiographs.
The effective doses from CBCT examinations centred on the parotid and submandibular glands were similar to those calculated for plain radiograph sialography when a 15 cm FOV was chosen in combination with exposure conditions of 80 kVp and 10 mA.
作为使用锥形束 CT（CBCT）进行多维唾液腺造影术方案制定的第一步，本研究旨在比较腮腺和下颌下腺的常规 X 线摄影和 CBCT 唾液腺造影的有效辐射剂量。
使用辐射模拟剂量计（RANDO）体模，在 25 个选定的头颈部位置进行剂量测量，并采用国际辐射防护委员会 2007 年组织权重因子计算有效剂量。
有效剂量（E）随 CBCT 视野（FOV）、峰值千伏（kVp）和毫安（mA）的变化而变化。具体而言，腮腺研究中 E 从最大值 932 微Sv（30cm FOV、120kVp、15mA）降至 60 微Sv（15cm FOV、80kVp、10mA），下颌下腺研究中降至 148 微Sv（15cm FOV、80kVp、10mA）。在腮腺和下颌下腺唾液腺造影过程中进行的一系列常规 X 射线摄影的有效剂量分别为 65 微Sv 和 156 微Sv。常规腮腺系列包括一张全景片、两张前后颅骨片和四张侧颅骨片，而下颌下腺系列包括一张全景片、一张标准下颌咬合片和四张侧颅骨片。
当选择 15cm FOV 并结合 80kVp 和 10mA 的曝光条件时，CBCT 检查中心位于腮腺和下颌下腺的有效剂量与常规 X 线摄影唾液腺造影术计算出的有效剂量相似。
