1973
DOI: 10.1148/106.2.433
|View full text |Cite
|
Sign up to set email alerts
|

Computer and Approximation Methods of Calculating Depth Dose in Irregularly Shaped Fields

Abstract: A computer program was developed to calculate depth dose in irregularly shaped fields. The program is general for any shaped field and includes corrections for variations of exposure rate within the field, body contour, and non-nominal source-skin distances. Depth doses were calculated in several actual cases involving irregular fields such as mantle, split, L-shaped, and inverted Y fields. Data were examined to determine the degree of dose inhomogeneity in these fields. An approximation method used in the irr… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
4

Citation Types

0
8
0

Year Published

1982
1982
2020
2020

Publication Types

Select...
8

Relationship

0
8

Authors

Journals

citations
Cited by 17 publications
(8 citation statements)
references
References 5 publications
0
8
0
Order By: Relevance
“…6 The photon and electron fluence from the head of the accelerator can be greatly changed by the collimators 6,7 but changes by less than 2% by external blocks. 6,[8][9][10][11][12][13] The effect of blocks on the accelerator-head-scatter component is observed as a change in incident fluence due to scatter off the block and to occlusion by the block of scatter off the flattening filter and other components in the accelerator head. 12 The basic methods for separating these components of dose involves the measurement of the total scatter factor in a phantom, S hp , and either the head-scatter factor, S h , or the phantom-scatter factor, S p , individually.…”
Section: Introductionmentioning
confidence: 99%
“…6 The photon and electron fluence from the head of the accelerator can be greatly changed by the collimators 6,7 but changes by less than 2% by external blocks. 6,[8][9][10][11][12][13] The effect of blocks on the accelerator-head-scatter component is observed as a change in incident fluence due to scatter off the block and to occlusion by the block of scatter off the flattening filter and other components in the accelerator head. 12 The basic methods for separating these components of dose involves the measurement of the total scatter factor in a phantom, S hp , and either the head-scatter factor, S h , or the phantom-scatter factor, S p , individually.…”
Section: Introductionmentioning
confidence: 99%
“…The introduction of concepts of tissue-air ratio (TAR) 1 , tissue-phantom ratio (TPR) 2 , and tissue-maximum ratio (TMR) 3 made this algorithm rather successful in the regime of homogenous media. A typical example of this algorithm is Clarkson's technique 4 and IRREG [5][6] that are still commonly used in clinic for manual dose calculation and in some commercial software used for second-hand dose check (RadCalc, Lifeline Software Inc., Austin, Texas, USA). For homogenous media, such as water, this calculation algorithm gives rather accurate results.…”
mentioning
confidence: 99%
“…3 The dose calculation algorithms have seen generations of development. The early generations of algorithms, usually referred to as correction-based methods, [4][5][6][7] are barely physics principle driven. Their accuracy is highly unreliable in heterogeneous regions (for instance, areas with lung tissue surrounding tumors), where the loss of electronic equilibrium occurs.…”
Section: Introductionmentioning
confidence: 99%
“…The dose calculation algorithms have seen generations of development. The early generations of algorithms, usually referred to as correction-based methods [4][5][6][7],…”
Section: Introductionmentioning
confidence: 99%