Multiple Scanning Effects in Radiochromic Film Dosimetry: A Method to Reduce the Increase of Optical Density

• 作者: Albert Mouelle Sone Alexandre Ngwa Ebongue Benjamin Foe Ngono Daniel Bongu Moise G. Kwato Njock
• 来源期刊: 医学物理学、临床工程、放射肿瘤学(英文)
• 学科: 物理学
• 关键词: FLATBED SCANNER MULTIPLE Scans Optical Density Radiochromic Film
• 年，卷（期）: 2020,（1）
• 页码范围: 34-41
• 页数: 8页
• 分类号: O48

摘要

In this work, a method to reduce increase in optical density (OD) caused by multiple scanning in radiochromic film dosimetry in combination with a flatbed scanner is presented. Gafchromic EBT3 films are scanned with Epson Pro 1680 Expression scanner and time intervals of 15 minutes and 30 minutes are observed between consecutive scans to reduce the increase in temperature of the scanner. The maximum variations in OD after consecutive scans are calculated and compared to the values obtained for scans without interruption. For film irradiated to 3 Gy, a time interval of 15 minutes between two successive scans leads to a reduction of the OD increase of 56.2% compared to when films are scanned without interruption. Reductions of OD increase of 86.72% and 78.72% respectively for film irradiated to 1 Gy and 2 Gy are obtained when a time interval of 30 minutes is left between two successive scans. These results show that when time intervals are observed between consecutive scans, the increase in OD has significantly reduced. However, the method has the drawback of increasing the time needed to perform radiochromic film dosimetry.