Characterization and evaluation of 2.5 MV electronic portal imaging for accurate localization of intra‐ and extracranial stereotactic radiosurgery

2.5 MV electronic portal imaging, available on Varian TrueBeam machines, was characterized using various phantoms in this study. Its low‐contrast detectability, spatial resolution, and contrast‐to‐noise ratio (CNR) were compared with those of conventional 6 MV and kV planar imaging. Scatter effect i...

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Bibliographic Details
Published in:	Journal of applied clinical medical physics Vol. 17; no. 4; pp. 268 - 284
Main Authors:	Song, Kwang Hyun, Snyder, Karen Chin, Kim, Jinkoo, Li, Haisen, Ning, Wen, Rusnac, Robert, Jackson, Paul, Gordon, James, Siddiqui, Salim M., Chetty, Indrin J.
Format:	Journal Article
Language:	English
Published:	United States John Wiley & Sons, Inc 08-07-2016 John Wiley and Sons Inc
Subjects:	2.5 MV portal imaging Accuracy Anthropomorphism Brain Neoplasms - diagnostic imaging Brain Neoplasms - surgery Cone-Beam Computed Tomography - methods Head and Neck Neoplasms - diagnostic imaging Head and Neck Neoplasms - surgery Humans Image Processing, Computer-Assisted - methods Localization Lung Neoplasms - diagnostic imaging Lung Neoplasms - surgery Male Noise Particle Accelerators Patients Phantoms, Imaging Quality Radiation Dosage Radiation Oncology Physics radiation therapy Radiosurgery - methods Radiotherapy Planning, Computer-Assisted - methods Radiotherapy, Intensity-Modulated - methods stereotactic body stereotactic radiosurgery Palo Alto California
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Summary:	2.5 MV electronic portal imaging, available on Varian TrueBeam machines, was characterized using various phantoms in this study. Its low‐contrast detectability, spatial resolution, and contrast‐to‐noise ratio (CNR) were compared with those of conventional 6 MV and kV planar imaging. Scatter effect in large patient body was simulated by adding solid water slabs along the beam path. The 2.5 MV imaging mode was also evaluated using clinically acquired images from 24 patients for the sites of brain, head and neck, lung, and abdomen. With respect to 6 MV, the 2.5 MV achieved higher contrast and preserved sharpness on bony structures with only half of the imaging dose. The quality of 2.5 MV imaging was comparable to that of kV imaging when the lateral separation of patient was greater than 38 cm, while the kV image quality degraded rapidly as patient separation increased. Based on the results of patient images, 2.5 MV imaging was better for cranial and extracranial SRS than the 6 MV imaging. PACS number(s): 87.57.C
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Undefined-1 ObjectType-Feature-3 content type line 23
ISSN:	1526-9914 1526-9914
DOI:	10.1120/jacmp.v17i4.6247