Stenström B, Henrikson C O, Holm B, Richter S
Swed Dent J. 1986;10(1-2):59-71.
Thermoluminescence dosimeters were used in a phantom head and on patients to measure the absorbed dose to organs of special interest from full surveys with intraoral films (20 exposures) and single bitewing exposures. Two x-ray machines were used, operating at 65 kVp. The apertures of the circular tube collimators had diameters of 55 mm and 48 mm. Rectangular (35 mm X 44 mm) tube collimators were also used. The distance from the x-ray focus to the open end of the collimators (FSD) was 0.20 and 0.35 m. Exposure values for Kodak Ultra-Speed film (speed group D) were used. The maximum skin dose measured from the full surveys decreased by 25 per cent on changing from the circular to the rectangular apertures. Using 0.35 m FSD and rectangular collimator the maximum skin dose was 13 mGy. The absorbed doses to the salivary glands and the thyroid gland were significantly reduced on changing from circular to rectangular apertures. The doses in the central part of the parotid and the thyroid glands were then 0.5 and 0.12 mGy, respectively, from a full survey with 20 intraoral films. With a leaded shield the thyroid dose was reduced to 0.05 mGy. All dose values could be further reduced by 40 per cent by using Kodak Ektaspeed film (speed group E).
热释光剂量计用于模拟头部和患者身上，以测量使用口内胶片进行全面检查（20次曝光）和单次咬合翼片曝光时，特定感兴趣器官的吸收剂量。使用了两台X射线机，工作电压为65 kVp。圆形管准直器的孔径直径分别为55毫米和48毫米。还使用了矩形（35毫米×44毫米）管准直器。X射线焦点到准直器开口端的距离（焦皮距）为0.20米和0.35米。使用了柯达超高速胶片（速度组D）的曝光值。从全面检查测量得到的最大皮肤剂量，从圆形孔径改为矩形孔径时降低了25%。使用0.35米焦皮距和矩形准直器时，最大皮肤剂量为13毫戈瑞。从圆形孔径改为矩形孔径时，唾液腺和甲状腺的吸收剂量显著降低。使用20张口内胶片进行全面检查时，腮腺中部和甲状腺的剂量分别为0.5毫戈瑞和0.12毫戈瑞。使用铅屏蔽后，甲状腺剂量降至0.05毫戈瑞。使用柯达爱克泰速胶片（速度组E）可使所有剂量值进一步降低40%。
