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Clinical evaluation of a dose management system-integrated 3D skin dose map by comparison with radiochromic films

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Abstract

Objectives

To validate the performance of an automatic tool to estimate a patient’s peak skin dose (PSD) and a skin dose map from data collected by a radiation dose management system (RDMS) during interventional procedures.

Methods

In total, 288 eligible consecutive patients undergoing abdominopelvic embolisation or planned coronary angioplasty using radiochromic films were screened between June 2018 and March 2019. For 98 included patients, PSD was measured using radiochromic films (PSDFilm) and computed by RDMS (PSDRDMS) using one flat and two anthropomorphic phantoms. Statistical concordance between PSDFilm and PSDRDMS was computed with Lin’s concordance correlation coefficient and clinical concordance with the Bland and Altman graphic; values were compared using the paired Mann-Whitney-Wilcoxon test.

Results

In total, 190/288 patients were excluded and 98 patients were analysed (69 men, mean age 66 ± 14 years). The PSDFilm median (1st; 3rd quartile) was 0.59 Gy (0.40; 1.08). PSDRDMS was 0.62 Gy (0.43; 1.22) for the flat phantom and 0.62 Gy (0.42; 1.19) for anthropomorphic phantoms. The concordance between PSDFilm and PSDRDMS was good for both phantoms (flat: 0.94 [0.91; 0.95]; anthropomorphic 0.94 [0.91; 0.96]). Compared with the values of PSDFilm, the values of PSDRDMS were significantly increased by 5% (− 4%; 16%) for flat phantom (p = 0.001) and 7% (− 6%; 22%) for anthropomorphic phantoms (p = 0.002) for vascular procedures and 9% (− 4%; 26%, p = 0.01) and 6% (− 4%; 23%, p = 0.02) for cardiac procedures, respectively. Dose map representations matched for most patients. The gaps identified were due to table displacement during fluoroscopy events and the use of a wedge filter.

Conclusions

The RDMS skin dose map tool allowed the computation of the PSD and skin dose distribution for all patients with fewer constraints than radiochromic films. However, the computed PSD was overestimated, increasing the number of patients requiring follow-up.

Key Points

A good concordance correlation was identified between the peak skin dose (PSD) values measured with radiochromic films and estimated with the radiation dose management system (RDMS) skin dose map tool.

Differences were related to table displacement during fluoroscopy events and the use of a wedge filter, which are not accounted in the Digital Imaging and Communications in Medicine Radiation Dose Structured Reports.

For all procedures, the estimated PSDs were significantly higher than the measured PSDs by 5% (− 4%; 18%) for flat phantom (p < 0.001) and 6% (− 5%; 22%) for anthropomorphic phantoms (p < 0.001).

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Abbreviations

AEE:

Abdominal elective embolisation for renal or hepatic tumours and visceral aneurysms

AUE:

Abdominal urgent embolisation for active bleeding or vascular injury from splenic, renal, hepatic, mesenteric or hypogastric arteries

BMI:

Body mass index

CA:

Coronary angioplasty

CA-PTCA:

Coronary angiography and coronary angioplasty for one vessel

CTO:

Coronary angioplasty of complex chronic total occlusion

DICOM:

Digital Imaging and Communications in Medicine

HCE:

Hepatic transarterial chemoembolisation with iodised oil

ICRP:

International Commission on Radiological Protection

IRP:

Interventional reference point

Ka:

Air kerma

Ni:

Number of fluorography images

PEE:

Pelvis elective embolisation for planned prostatic embolisation

PSD:

Peak skin dose

PUE:

Pelvis urgent embolisation for bleeding from the pelvis (prostatic, cystic, trauma bleeding)

RDMS:

Radiation dose management system

RDSR:

Radiation dose structured report

ROI:

Region of interest

SDM:

Skin dose map

SRPD:

Source to reference point distance

Tf:

Fluoroscopy time

UEE:

Uterine elective embolisation for fibroids or vascular malformations

UUE:

Uterine urgent embolisation for postpartum haemorrhage

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Funding

The authors state that this work has not received any funding.

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Correspondence to Joël Greffier.

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Guarantor

The scientific guarantor of this publication is Jean Paul Beregi.

Conflict of interest

N. Grussenmeyer-Mary and D. Miller declare relationships with the following companies: GE Healthcare.

Statistics and biometry

C. Demattei kindly provided statistical advice for this manuscript.

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Written informed consent was waived by the Institutional Review Board.

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Institutional Review Board approval was obtained.

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Greffier, J., Grussenmeyer-Mary, N., Hamard, A. et al. Clinical evaluation of a dose management system-integrated 3D skin dose map by comparison with radiochromic films. Eur Radiol 30, 5071–5081 (2020). https://doi.org/10.1007/s00330-020-06877-8

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  • DOI: https://doi.org/10.1007/s00330-020-06877-8

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