Rectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation.
AffiliationNorth Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. firstname.lastname@example.org
MetadataShow full item record
AbstractThe implementation of intensity modulated radiotherapy by dynamic multileaf collimator control involves the use of interpreter software which creates leaf trajectory plans for each leaf pair. Interpreter software for use with an Elekta SL15 linear accelerator and dedicated multileaf collimator has been written and tested. In practice the ideal trajectory plans often predict contact between leaves from opposing leaf banks, but this is prohibited by control software on the Elekta system as it could lead to mechanical damage. If the modulation within the geometric limits of a shaped field is not to be compromised then strategies to avoid leaf contact result in additional unwanted doses outside the geometric edge. The magnitude of any such additional dose can be reduced to acceptable levels by a technique which we have called rectangular edge synchronization. The performance of interpreter software which incorporates rectangular edge synchronization has been compared with that of potentially more efficient software which does not. The option containing the rectangular edge synchronization algorithm was shown to work consistently well at high monitor unit rates, and without incurring leaf contacts, under a wide range of test conditions. It therefore provides a sound basis for using intensity modulation to replace mechanical wedges, to simulate customized patient shape compensators, or to implement the results of inverse treatment planning processes that require superimposed intensity modulated beams.
CitationRectangular edge synchronization for intensity modulated radiation therapy with dynamic multileaf collimation. 1998, 43 (10):2769-84 Phys Med Biol
JournalPhysics in Medicine and Biology
- An experimental investigation into the radiation field offset of a dynamic multileaf collimator.
- Authors: Vial P, Oliver L, Greer PB, Baldock C
- Issue date: 2006 Nov 7
- Algorithms for optimal sequencing of dynamic multileaf collimators.
- Authors: Kamath S, Sahni S, Palta J, Ranka S
- Issue date: 2004 Jan 7
- Clinical implementation of intensity-modulated arc therapy.
- Authors: Yu CX, Li XA, Ma L, Chen D, Naqvi S, Shepard D, Sarfaraz M, Holmes TW, Suntharalingam M, Mansfield CM
- Issue date: 2002 Jun 1
- A practical method to calculate head scatter factors in wedged rectangular and irregular MLC shaped beams for external and internal wedges.
- Authors: Georg D, Olofsson J, Künzler T, Aiginger H, Karlsson M
- Issue date: 2004 Oct 21
- [Use of a multileaf collimator for the production of intensity-modulated beams].
- Authors: Papatheodorou S, Rosenwald JC, Castellanos ME, Zefkili S, Bonvalet L, Gaboriaud G
- Issue date: 1998 Jul-Aug