针对国际辐射防护委员会(ICRP),降低了透镜等效剂量限制,日本将镜片剂量限制从150mSv/年降低到100mSv/5年和50mSv/年,这项新规定将于2021年4月1日生效。DOSIRIS®是一种剂量计,可以精确测量镜片剂量。在这里,我们使用颈部剂量计和晶状体剂量计测量,调查了介入心脏病学医师在降低晶状体剂量限制前后1年的晶状体剂量.随着案件数量的增加,两者的个人剂量当量为0.07mm[Hp(0.07),颈部剂量计]和3mm深度的个人剂量当量[Hp(3),大多数医生的镜头剂量计]增加了。考虑到使用透镜剂量计的Pb眼镜的屏蔽效果,透镜的Hp(3)对于14名医生中的两名超过20mSv/年。防护辐射剂量在未来将变得更加重要,因为这两位医生的辐射剂量可能超过100mSv/5年。每次手术的平均剂量增加了,但不是很重要。颈部剂量计和晶状体剂量计评分之间有很强的相关性,尽管降低晶状体剂量限制前后没有显着变化。对于主要治疗患者的医生来说,这种相关性特别强。因此,在主要进行诊断的医生中,可以从颈部剂量推断准确的晶状体剂量。然而,期望使用由于高透镜剂量而能够直接测量Hp(3)的剂量计。
In response to the International Commission on Radiological Protection (ICRP), which lowered the lens equivalent dose limit, Japan lowered the lens dose limit from 150 mSv/year to 100 mSv/5 years and 50 mSv/year, with this new rule taking effect on April 1, 2021. DOSIRIS® is a dosimeter that can accurately measure lens dose. Herein, we investigated lens dose in interventional cardiology physicians one year before and after the reduction of the lens dose limit using a neck dosimeter and lens dosimeter measurements. With an increase in the number of cases, both personal dose equivalent at 0.07 mm [Hp(0.07), neck dosimeter] and personal dose equivalent at 3 mm depth [Hp(3), lens dosimeter] increased for most of the physicians. The Hp(3) of the lens considering the shielding effect of the Pb glasses using lens dosimeter exceeded 20 mSv/year for two of the 14 physicians. Protection from radiation dose will become even more important in the future, as these two physicians may experience radiation dose exceeding 100 mSv/5 years. The average dose per procedure increased, but not significantly. There was a strong correlation between the neck dosimeter and lens dosimeter scores, although there was no significant change before and after the lens dose limit was lowered. This correlation was particularly strong for physicians who primarily treated patients. As such, it is possible to infer accurate lens doses from neck doses in physicians who primarily perform diagnostics. However, it is desirable to use a dosimeter that can directly measure Hp(3) because of the high lens dose.