Ori, Antonella Centonze, Gianluca Ciliberti, Massimiliano Copetti, Michele Corritore, Leonardo D’Aloiso, Maria Maddalena D’Errico, Salvatore De Cosmo, Angela de Matthaeis, Alfredo Del Gaudio, Annabella Di Giorgio, Lazzaro di Mauro, Vincenzo Giambra, Antonio Greco, Andrea Fontana, Vincenzo Inchingolo, Michele Inglese, Maria Labonia, Antonella La Marca, Tiziana Latiano, Maurizio Leone, Evaristo Maiello, Alessandra Mangia, Carmen Marciano, Valentina Massa, Simonetta Massafra, Antonio Mirijello, Grazia Vittoria Orciulo, Nicola Palladino, Rita Perna, Matteo Piemontese, Michele Antonio Prencipe, Pamela Raggi, Maria Grazia Rodriquenz, Raffaele Russo, Daniele Sancarlo, Annalisa Simeone, Vincenzo Trischitta, Michele Zarrelli, Pasquale Vaira, Doriana Vergara, Angelo Luigi Vescovi. Conflicts of Interest: The authors declare no conflict of interest.
diagnosticsArticleDevelopment of an Electronic Portal Imaging Device Dosimetry MethodJun Zhang 1 , Ziting Fan 1 , Xile Zhang two , Ruijie Yang two and Junhai Wen 1, Division of Biomedical Engineering, School of Life Science, Beijing Institute of Technologies, Beijing 100081, China; [email protected] (J.Z.); [email protected] (Z.F.) Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China; [email protected] (X.Z.); [email protected] (R.Y.) Correspondence: [email protected]: Support arm backscatter and offaxis effects of an electronic portal imaging device (EPID) are challenging for radiotherapy excellent Recombinant?Proteins Cathepsin H Protein assurance. Aiming in the issue, we proposed a easy yet productive strategy with correction matrices to rectify backscatter and offaxis responses for EPID pictures. 1st, we measured the square fields with ionization chamber array (ICA) and EPID simultaneously. Second, we calculated the dosetopixel worth ratio and employed it because the correction matrix with the corresponding field. Third, the correction value on the massive field was replaced with that with the very same point inside the modest field to create a correction matrix appropriate for different EPID images. Ultimately, we 4-1BBR/TNFRSF9 Protein C-6His rectified the EPID image with all the correction matrix, then the processed EPID photos had been converted in to the absolute dose. The calculated dose was compared with the measured dose through ICA. The gamma pass prices of 3 /3 mm and 2 /2 mm (five threshold) were 99.6 0.94 and 95.48 1.03 , plus the average gamma values have been 0.28 0.04 and 0.42 0.05, respectively. Experimental outcomes verified our system accurately corrected EPID photos and converted pixel values into absolute dose values such that EPID was an effective radiotherapy dosimetry tool.Citation: Zhang, J.; Fan, Z.; Zhang, X.; Yang, R.; Wen, J. Improvement of an Electronic Portal Imaging Device Dosimetry Strategy. Diagnostics 2021, 11, 1654. https://doi.org/10.3390/ diagnostics11091654 Academic Editor: Kalevi Kairemo Received: 26 July 2021 Accepted: six September 2021 Published: 9 SeptemberKeywords: radiotherapy; high-quality assurance; EPID; portal dosimetry; backscatter; offaxis1. Introduction Intensitymodulated radiation therapy (IMRT) and volumetricmodulated arc therapy (VMAT) are widely made use of in radiotherapy because they can make sure that the tumor area receives greater and much more conformal doses and lower unnecessary radiation exposure from the surrounding normal tissues. Due to its design and style and implementation complexity, patientspecific dose verification has been advised to guarantee the delivery dose is consistent together with the prescribed dose [1]. An electronic portal imagin.