Houston C S
Can Med Assoc J. 1977 Sep 17;117(6):648-51.
The date of onset of the last menstrual period should be given on radiographic requisitions for all women of reproductive age. Every effort should be made to avoid unnecessary irradiation of any woman who might be pregnant. Radiation damage in the first 2 weeks of pregnancy, however, should be "all or none", resulting in either a miscarriage or a normal child. Diagnostic radiology procedures are not indications for therapeutic abortion. Ultrasound has now replaced ionizing radiation in most examinations of the fetus and placenta. Pelvimetry should be done only when the decision to do a cesarean section hinges on precise knowledge of measurements of the bony pelvis. On the rare occasion when a radiograph of the fetus is necessary the woman should be prone for the examination. All such examinations are best ordered after consultation with a radiologist. Radiography of distant areas with the beam directed away from the woman's abdomen can be done without concern at any stage of pregnancy.
所有育龄女性的X线检查申请单上都应注明末次月经的起始日期。应尽一切努力避免对任何可能怀孕的女性进行不必要的辐射。然而，怀孕前两周的辐射损伤应为“全或无”，要么导致流产，要么生出正常的孩子。诊断性放射学检查并非治疗性流产的指征。现在，在大多数胎儿和胎盘检查中，超声已取代了电离辐射。只有在剖宫产的决定取决于对骨盆骨骼精确测量的情况下，才应进行骨盆测量。极少数情况下，若需要对胎儿进行X线检查，女性应采取俯卧位进行检查。所有此类检查最好在咨询放射科医生后再安排。在怀孕的任何阶段，都可以对远离女性腹部的部位进行X线检查，无需担心。
