PMID- 10360533
OWN - NLM
STAT- MEDLINE
DCOM- 19990813
LR  - 20170214
IS  - 0094-2405 (Print)
IS  - 0094-2405 (Linking)
VI  - 26
IP  - 5
DP  - 1999 May
TI  - Dosimetric characteristics of a double-focused miniature multileaf collimator.
PG  - 729-33
AB  - The dosimetric characteristics of a double-focused miniature multileaf collimator 
      (mMLC) attached to a Philips SL75/5 linear accelerator (linac) have been 
      investigated. Output factors, percentage depth-dose, penumbra, leaf transmission, 
      and leakage between the leaves were measured for the 6 MV x-ray beam on this 
      accelerator. Because leakage both through and between the leaves is minimal, the 
      linac jaws can be kept fixed while the mMLC leaf configuration is modified for 
      different aperture shapes. This allows for accurate output prediction using the 
      equivalent square formalism. Percent depth-dose measured for fields defined by 
      the mMLC show little deviation from the percent depth-dose measured for fields 
      defined by the machine jaws or Lipowitz metal blocks. Because the mMLC matches 
      beam divergence in both directions, allows minimal beam transmission, and has a 
      large source-to-collimator distance, the penumbra is sharper for fields defined 
      by the mMLC than for fields defined by the linac jaws or Lipowitz metal blocks. 
      Based on these data, dose calculations for mMLC-defined fields can be applied 
      with no change in procedures from those used for fields defined using 
      conventional methods.
FAU - Meeks, S L
AU  - Meeks SL
AD  - Department of Radiation Oncology, University of Florida College of Medicine, 
      Gainesville 32610-0385, USA. meekssl@bolus.health.ufl.edu
FAU - Bova, F J
AU  - Bova FJ
FAU - Kim, S
AU  - Kim S
FAU - Tome, W A
AU  - Tome WA
FAU - Buatti, J M
AU  - Buatti JM
FAU - Friedman
AU  - Friedman
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Med Phys
JT  - Medical physics
JID - 0425746
SB  - IM
MH  - Radiotherapy Planning, Computer-Assisted/*instrumentation/*methods
MH  - Radiotherapy, Computer-Assisted/*instrumentation
EDAT- 1999/06/09 00:00
MHDA- 1999/06/09 00:01
CRDT- 1999/06/09 00:00
PHST- 1999/06/09 00:00 [pubmed]
PHST- 1999/06/09 00:01 [medline]
PHST- 1999/06/09 00:00 [entrez]
AID - 10.1118/1.598579 [doi]
PST - ppublish
SO  - Med Phys. 1999 May;26(5):729-33. doi: 10.1118/1.598579.