Massachusetts General Hospital, 55 Fruit Str, Boston, MA, 02114, USA.
Radiology Department, Massachusetts General Hospital, 175 Cambridge Str., Suite 244, Boston, MA, 02114, USA.
Eur Radiol. 2021 Sep;31(9):6612-6620. doi: 10.1007/s00330-021-07734-y. Epub 2021 Mar 8.
To assess the magnitude and characterization of CT imaging protocols of patients receiving 50 or 100 mSv in a single day.
In this multicentric retrospective study covering up to 279 hospitals from January 2015 to December 2019, the effective dose (E) as estimated by dose management system from dose length product of patients was filtered and grouped into per-day dose bands (≤ 20, > 20-50, > 50-70, > 70-100, > 100-200, > 200 mSv). Information on patient's age and imaging protocol was noted. The data were analyzed to determine the frequency of occurrence in each dose band. Top 20 CT imaging protocols that led to patients with a dose of ≥ 50 mSv in a single acquisition were identified and their relative frequency was estimated.
A total of approx. 4.3 million (4,283,738) CT exams were performed in approx. 3.9 million (3,880,524) patient-days indicating 9.41% had more than one CT exam in a single day. There were 31,058 (0.8%) patient-days with ≥ 50 mSv and 1191 (0.03%) with ≥ 100 mSv. Nearly 1/3 patient-days reaching ≥ 50 mSv were of patients aged 50 years or younger. The top 20 CT imaging protocols that led to ≥ 50 mSv in a single day belonged to the body region (chest or abdomen and pelvis) and nearly one-third were angiographic studies.
In the first study of its kind, we report that patients with 50 mSv+ in a single day or a single exam are not rare. The information on imaging protocols leading to such doses and their frequency has been provided to help develop dose management strategies.
• Our study of 4,283,738 CT exams performed in 3,880,524 patient-days indicates 0.8% with 50 mSv+ and 0.03% with 100 mSv+ in a single day. • A total of 9.41% underwent more than one CT exam in a single day; nearly 1/3 of those with 50 mSv+ were ≤ 50 years of age. • Identified top 20 CT imaging protocols that led to 50 mSv+ doses in a single exam. All belong to chest or abdomen and pelvis and nearly 1/3 were angiographic studies.
评估在一天内接受 50 或 100 mSv 单次剂量的患者的 CT 成像方案的幅度和特征。
在这项多中心回顾性研究中，涵盖了 2015 年 1 月至 2019 年 12 月期间的 279 家医院，通过剂量长度乘积从剂量管理系统中过滤并将每位患者的有效剂量（E）分组到每日剂量带（≤ 20、> 20-50、> 50-70、> 70-100、> 100-200、> 200 mSv）。记录患者年龄和成像方案的信息。分析数据以确定每个剂量带的发生频率。确定导致单次采集剂量≥ 50 mSv 的前 20 种 CT 成像方案，并估计其相对频率。
共进行了约 430 万（4283738 次）CT 检查，涉及约 390 万（3880524 天）患者，表明 9.41%的患者在一天内进行了一次以上的 CT 检查。有 31058 次（0.8%）患者日剂量≥ 50 mSv，有 1191 次（0.03%）患者日剂量≥ 100 mSv。近 1/3 达到≥ 50 mSv 的患者日龄在 50 岁及以下。导致单日剂量≥ 50 mSv 的前 20 种 CT 成像方案属于身体区域（胸部或腹部和骨盆），近三分之一为血管造影研究。
在首例此类研究中，我们报告称，单日或单次检查剂量达到 50 mSv+的患者并不罕见。已提供有关导致此类剂量的成像方案及其频率的信息，以帮助制定剂量管理策略。
我们对 4283738 次 CT 检查和 3880524 天患者日进行的研究表明，单日剂量≥ 50 mSv 的比例为 0.8%，单日剂量≥ 100 mSv 的比例为 0.03%。
共有 9.41%的患者在一天内进行了一次以上的 CT 检查；其中近 1/3 的 50 mSv+患者年龄≤ 50 岁。
确定了导致单次检查剂量≥ 50 mSv 的前 20 种 CT 成像方案。所有这些方案都属于胸部或腹部和骨盆，近三分之一为血管造影研究。
