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ICDA-5

Jun 7 – 11, 2026
Prague, Czechia
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Assessment of Two Scanners and Two Softwares on the Calibration Curves and Absorbed Dose of Radiochromic Films

Jun 9, 2026, 9:45 AM
15m
Auditorium 103

Auditorium 103

Břehová 7, Prague 1
Oral Presentation Dosimetry and radiation protection in medicine and biology Dosimetry and radiation protection in medicine and biology

Speaker

Jian-Kai Hong (Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan)

Description

Purpose:

This study compared dose differences between FilmQA Pro and ImageJ for film dosimetry, using a high‑cost professional flatbed scanner and a low‑cost consumer multifunction printer scanner in a clinically relevant breast phantom setup.

Methods:

Following a clinical breast treatment plan, EBT4 was irradiated with a 6 MV photon beam and placed at a depth of 1.5 cm within a breast phantom to simulate clinical conditions. The films were scanned using both Epson 12000XL and Canon PIXMA G3730. Dose was reconstructed using FilmQA Pro and ImageJ, and the film‑derived dose was compared point‑by‑point with the treatment‑planning system (TPS) calculated dose at the corresponding depth. All workflows were based on the red channel.

Results:

The TPS dose range of nine treatment plans was 186.28 to 215.25 cGy. With the Epson 12000XL scanner, FilmQA Pro yielded a dose range of 151.1 to 210.4 cGy (percentage bias: –20.45% to –2.25%), while ImageJ produced a range of 166.05 to 212.01 cGy. Using the Canon PIXMA G3730 scanner, FilmQA Pro results ranged from 163.9 to 202.4 cGy (bias: –13.47% to –5.97%), whereas ImageJ results ranged from 179.63 to 220.37 cGy (bias: –5.17% to +2.38%). When the low‑cost scanner was used, FilmQA Pro consistently exhibited a greater negative bias than ImageJ, with inter‑software differences of approximately 8–12% across measurement points.

Conclusion:

Dosimetric agreement between EBT4 film measurements and TPS calculations under red‑channel analysis was strongly influenced by the scanner–software combination. Within the studied breast phantom geometry, the use of a low‑cost multifunction printer scanner (Canon PIXMA G3730) with ImageJ software achieved dose deviations within a few percent of the TPS, supporting its feasibility for quality assurance in clinical breast radiotherapy. Nevertheless, thorough validation of each specific hardware–software workflow remains imperative before clinical adoption.

Keywords:

EBT4, gafchromic film, film dosimetry, dose verification

Authors

Jian-Kai Hong (Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan) Dr Chun-Yen Yu (Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan)

Co-authors

Dr Hsi-Ya Chao (1. Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan 2. Department of Biomedical Engineering, Chung Yuan Christian Universityl, Taoyuan , Taiwan 3. Department of Radiation Oncology, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi, Taiwan) Dr Yuan-Chun Lai (1. Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan 2. Department of Radiation Oncology, Changhua Christian Hospital, Changhua, Taiwan) Mr Shin-Yu Chen (Department of Radiation Oncology, Changhua Christian Hospital, Changhua, Taiwan) Dr Bing-Ru Peng (Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan)

Presentation materials

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