TY - JOUR
T1 - Characterization and evaluation of 2.5 MV electronic portal imaging for accurate localization of intra-and extracranial stereotactic radiosurgery
AU - Song, Kwang Hyun
AU - Snyder, Karen Chin
AU - Kim, Jinkoo
AU - Li, Haisen
AU - Ning, Wen
AU - Rusnac, Robert
AU - Jackson, Paul
AU - Gordon, James
AU - Siddiqui, Salim M.
AU - Chetty, Indrin J.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - 2.5 MV portal imaging
KW - Stereotactic body radiation therapy
KW - Stereotactic radiosurgery
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U2 - 10.1120/jacmp. v17i4.6247
DO - 10.1120/jacmp. v17i4.6247
M3 - Article
C2 - 27455505
SN - 1526-9914
VL - 17
SP - 268
EP - 284
JO - Journal of Applied Clinical Medical Physics
JF - Journal of Applied Clinical Medical Physics
IS - 4
ER -