| Περίληψη: | This study reports the establishment of Typical Diagnostic Reference Levels (DRLs)
values and the estimation of patients' doses during computed tomography (CT)-
guided biopsy procedures. To determine the doses received by patients, effective dose
(ED), entrance skin dose (ESD), and size-specific dose estimate (SSDE) were
calculated using conversion factors derived from the literature.
Research’s sample was taken from “Attikon” University Hospital. Five categories of
CT-guided percutaneous needle biopsies were analyzed, including iliac bone biopsies
(n=48), liver biopsies (n=57), lung biopsies (n=57), mediastinum biopsies (n=33), and
para-aortic tissue biopsies (n=31). A total of 226 CT-guided biopsies performed from
January 2017 to October 2022 by a single interventional radiologist were reviewed,
and all technical and dosimetric parameters were retrospectively collected for analysis
using DICOM data. Typical values of DRLs were calculated as the median values of
the distributions.
DRL values were proposed for the CTDIvol for the five categories of CT-guided
biopsy procedures. DRLs in terms of CTDIvol were 9.7 mGy for Iliac bone, 8.9 mGy
for liver, 8.8 mGy for lung, 7.9 mGy for mediastinal mass and 9 mGy for para-aortic
lymph nodes biopsy procedures for helical mode acquisitions. For biopsy scans, DRL
values were found to be 7.3 mGy, 7.7 mGy, 5.6 mGy, 5.6 mGy and 7.4 mGy
respevtively.
Typical DLRs were established as per the latest International Commission on
Radiological Protection report 135 definition for five categories of CT-guided biopsy
procedures without use of fluoroscopy. Helical scans across the entire anatomical
region greatly affect radiation dose compared to biopsy acquisitions.
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