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[Technical considerations on the usage of a general-purpose flatbed image scanner when making a dose-density table].

Harumitsu Hashimoto¹, Masanori Nakanishi, Motoi Watanabe

¹Department of Radiological Technology, Chigasaki Tokusyuukai Medical Center.

Nihon Hoshasen Gijutsu Gakkai Zasshi

|June 1, 2007

Summary

The DD-System uses a flatbed scanner to create dose-density tables from film. Careful film placement and sampling are crucial for accurate measurements, as peripheral scanner areas introduce errors.

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Area of Science:

Medical Physics
Radiological Imaging Technology

Context:

The DD-System analyzes film dosimetry using a flatbed image scanner.
Accurate dose-density tables are essential for radiation therapy planning and quality assurance.

Purpose:

To investigate technical challenges and measurement uncertainties associated with using a general-purpose flatbed scanner within the DD-System.
To identify optimal conditions for acquiring reliable analogue-to-digital conversion (ADC) values for dose-density calibration.

Summary:

Analysis of analogue-to-digital conversion (ADC) values from a flatbed scanner revealed normal distribution for uniform density films.
Measurement deviations were observed at the same pixel over time, after scanner warm-up, and significantly at peripheral scanner areas.
Shading the scanner periphery further highlighted non-negligible deviations, indicating potential inaccuracies in dose-density table generation.

Impact:

Implementing central film placement and selecting sampling areas with normal ADC value distribution is critical for accurate dose-density tables.
This research provides guidelines for optimizing the use of flatbed scanners in film dosimetry, enhancing the reliability of radiation dose analysis.
Ensuring accurate dose-density data improves the precision of radiation treatment planning and patient safety.