A precision translation stage for reproducing measured target volume motions.
The development of 4D imaging, treatment planning and treatment delivery methods for radiation therapy require the use of a high-precision translation stage for testing and validation. These technologies may require spatial resolutions of 1 mm, and temporal resolutions of 2-30 Hz for CT imaging, electromagnetic tracking, and fluoroscopic imaging. A 1D programmable translation stage capable of reproducing idealized and measured anatomic motions common to the thorax has been design and built to meet these spatial and temporal resolution requirement with phantoms weighing up to 27 kg. The stage consists of a polycarbonate base and table, driven by an AC servo motor with encoder feedback by means of a belt-coupled precision screw. Complex motions are possible through a programmable motion controller that is capable of running multiple independent control and monitoring programs concurrently. Programmable input and output ports allow motion to be synchronized with beam delivery and other imaging and treatment delivery devices to within 2.0 ms. Average deviations from the programmed positions are typically 0.2 mm or less, while the average typical maximum positional errors are typically 0.5 mm for an indefinite number of idealized breathing motion cycles and while reproducing measured target volume motions for several minutes.
Litzenberg
Dale W
DW
Department of Radiation Oncology, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
Hadley
Scott W
SW
Department of Radiation Oncology, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
Lam
Kwok L
KL
Department of Radiation Oncology, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
Balter
James M
JM
Department of Radiation Oncology, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007103:Immobilization / Q000295:instrumentation* / Q000379:methods; D008846:Micromanipulation / Q000295:instrumentation* / Q000379:methods; D009068:Movement; D009369:Neoplasms / Q000000981:diagnostic imaging* / Q000532:radiotherapy*; D011859:Radiography; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D012680:Sensitivity and Specificity
Med Phys. 2007 Jan;34(1):91-102
17278494
Med Phys. 2007 Jan;34(1):199-201
17278505
J Appl Clin Med Phys. 2005 Winter;6(1):13-21
15770194
Phys Med Biol. 2003 Jun 21;48(12):1773-84
12870582
Med Phys. 1999 May;26(5):715-20
10360531
Phys Med Biol. 2001 Jan;46(1):1-10
11197664
Med Phys. 1997 Mar;24(3):425-36
9089594
Int J Radiat Oncol Biol Phys. 2005 Mar 1;61(3):933-7
15708277
Int J Radiat Oncol Biol Phys. 2007 Mar 15;67(4):1088-98
17187940