Physical characteristics of a miniature multileaf collimator

P. Xia; P. Geis; L. Xing; C. Ma; D. Findley; K. Forster; Boyer Boyer

doi:10.1118/1.598478

Physical characteristics of a miniature multileaf collimator

P. Xia, P. Geis, L. Xing, C. Ma, D. Findley, K. Forster, Boyer Boyer

Cancer Signaling and Microenvironment (CSM)

Research output: Contribution to journal › Article › peer-review

70 Scopus citations

Abstract

A preliminary study of the physical characteristics of a miniature multileaf collimator (mMLC) used with 4 MV x rays is reported. The mMLC attached to the accessory mount of a class C or D Varian linear accelerator (Varian Oncology Systems, Palo Alto, CA) with a source to aperture distance of 65 cm. The field penumbra using the small leaves was found to be consistent with the anticipated field penumbra using photon jaws at the same source to aperture distance as the mMLC. The percentage depth dose values of square fields were found to be consistent with the fields collimated with the upper and lower jaws. Output factors for the very small fields were found to vary rapidly. Circular fields could be produced with depth dose characteristics similar to those produced using conical tertiary collimators, commonly used for radiosurgery, but with a broader penumbra.

Original language	English
Pages (from-to)	65-70
Number of pages	6
Journal	Medical Physics
Volume	26
Issue number	1
DOIs	https://doi.org/10.1118/1.598478
State	Published - Jan 1999

Keywords

Dose-Response Relationship, Radiation
Energy Transfer
Humans
Particle Accelerators/instrumentation
Radiosurgery
Radiotherapy Dosage
Radiotherapy, Computer-Assisted/methods
Sensitivity and Specificity

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title = "Physical characteristics of a miniature multileaf collimator",

abstract = "A preliminary study of the physical characteristics of a miniature multileaf collimator (mMLC) used with 4 MV x rays is reported. The mMLC attached to the accessory mount of a class C or D Varian linear accelerator (Varian Oncology Systems, Palo Alto, CA) with a source to aperture distance of 65 cm. The field penumbra using the small leaves was found to be consistent with the anticipated field penumbra using photon jaws at the same source to aperture distance as the mMLC. The percentage depth dose values of square fields were found to be consistent with the fields collimated with the upper and lower jaws. Output factors for the very small fields were found to vary rapidly. Circular fields could be produced with depth dose characteristics similar to those produced using conical tertiary collimators, commonly used for radiosurgery, but with a broader penumbra.",

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author = "P. Xia and P. Geis and L. Xing and C. Ma and D. Findley and K. Forster and Boyer Boyer",

year = "1999",

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doi = "10.1118/1.598478",

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AU - Xia, P.

AU - Geis, P.

AU - Xing, L.

AU - Ma, C.

AU - Findley, D.

AU - Forster, K.

AU - Boyer, Boyer

PY - 1999/1

Y1 - 1999/1

N2 - A preliminary study of the physical characteristics of a miniature multileaf collimator (mMLC) used with 4 MV x rays is reported. The mMLC attached to the accessory mount of a class C or D Varian linear accelerator (Varian Oncology Systems, Palo Alto, CA) with a source to aperture distance of 65 cm. The field penumbra using the small leaves was found to be consistent with the anticipated field penumbra using photon jaws at the same source to aperture distance as the mMLC. The percentage depth dose values of square fields were found to be consistent with the fields collimated with the upper and lower jaws. Output factors for the very small fields were found to vary rapidly. Circular fields could be produced with depth dose characteristics similar to those produced using conical tertiary collimators, commonly used for radiosurgery, but with a broader penumbra.

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KW - Dose-Response Relationship, Radiation

KW - Energy Transfer

KW - Humans

KW - Particle Accelerators/instrumentation

KW - Radiosurgery

KW - Radiotherapy Dosage

KW - Radiotherapy, Computer-Assisted/methods

KW - Sensitivity and Specificity

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JO - Medical Physics

JF - Medical Physics

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Physical characteristics of a miniature multileaf collimator

Abstract

Keywords

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