TY - JOUR
T1 - Gating characteristics of an Elekta radiotherapy treatment unit measured with three types of detector
AU - Evans, Philip M.
AU - Symonds-Tayler, J. Richard N.
AU - Colgan, Ruth
AU - Hugo, Geoffrey D.
AU - Letts, Nicky
AU - Sandin, Carlos
PY - 2010
Y1 - 2010
N2 - The characteristics of an Elekta Precise treatment machine with a gating interface were investigated. Three detectors were used: a Farmer ionization chamber, a MatriXX ionization chamber array and an in-house, single pulse-measurement ionization chamber (IVC). Measurements were made of dosimetric accuracy, flatness and symmetry characteristics and duty cycle for a range of beam-on times and gating periods. Results were compared with a standard ungated delivery as a reference. For all beam-on times, down to 0.5 s, dosimetric differences were below 1% and flatness and symmetry parameter variations were below 1.5%. For the shorter beam-on times the in-house detector deviated from the other two detectors, suggesting that this device should be used in conjunction with other detectors for absolute dosimetry purposes. However, it was found to be useful for studying gated beam characteristics pulse by pulse.
AB - The characteristics of an Elekta Precise treatment machine with a gating interface were investigated. Three detectors were used: a Farmer ionization chamber, a MatriXX ionization chamber array and an in-house, single pulse-measurement ionization chamber (IVC). Measurements were made of dosimetric accuracy, flatness and symmetry characteristics and duty cycle for a range of beam-on times and gating periods. Results were compared with a standard ungated delivery as a reference. For all beam-on times, down to 0.5 s, dosimetric differences were below 1% and flatness and symmetry parameter variations were below 1.5%. For the shorter beam-on times the in-house detector deviated from the other two detectors, suggesting that this device should be used in conjunction with other detectors for absolute dosimetry purposes. However, it was found to be useful for studying gated beam characteristics pulse by pulse.
UR - http://www.scopus.com/inward/record.url?scp=77950592157&partnerID=8YFLogxK
U2 - 10.1088/0031-9155/55/8/N02
DO - 10.1088/0031-9155/55/8/N02
M3 - Article
C2 - 20348610
AN - SCOPUS:77950592157
SN - 0031-9155
VL - 55
SP - N201-N210
JO - Physics in medicine and biology
JF - Physics in medicine and biology
IS - 8
ER -