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Dosimetric effects caused by couch tops and immobilization devices: Report of AAPM Task Group 176

Overview of attention for article published in Medical Physics, May 2014
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About this Attention Score

  • Above-average Attention Score compared to outputs of the same age (52nd percentile)
  • Good Attention Score compared to outputs of the same age and source (77th percentile)

Mentioned by

4 tweeters
2 Facebook pages


113 Dimensions

Readers on

289 Mendeley
Dosimetric effects caused by couch tops and immobilization devices: Report of AAPM Task Group 176
Published in
Medical Physics, May 2014
DOI 10.1118/1.4876299
Pubmed ID

Arthur J. Olch, Lee Gerig, Heng Li, Ivaylo Mihaylov, Andrew Morgan


The dosimetric impact from devices external to the patient is a complex combination of increased skin dose, reduced tumor dose, and altered dose distribution. Although small monitor unit or dose corrections are routinely made for blocking trays, ion chamber correction factors, e.g., accounting for temperature and pressure, or tissue inhomogeneities, the dose perturbation of the treatment couch top or immobilization devices is often overlooked. These devices also increase skin dose, an effect which is also often ignored or underestimated. These concerns have grown recently due to the increased use of monolithic carbon fiber couch tops which are optimal for imaging for patient position verification but cause attenuation and increased skin dose compared to the "tennis racket" style couch top they often replace. Also, arc delivery techniques have replaced stationary gantry techniques which cause a greater fraction of the dose to be delivered from posterior angles. A host of immobilization devices are available and used to increase patient positioning reproducibility, and these also have attenuation and skin dose implications which are often ignored. This report of Task Group 176 serves to present a survey of published data that illustrates the magnitude of the dosimetric effects of a wide range of devices external to the patient. The report also provides methods for modeling couch tops in treatment planning systems so the physicist can accurately compute the dosimetric effects for indexed patient treatments. Both photon and proton beams are considered. A discussion on avoidance of high density structures during beam planning is also provided. An important aspect of this report are the recommendations the authors make to clinical physicists, treatment planning system vendors, and device vendors on how to make measurements of surface dose and attenuation and how to report these values. For the vendors, an appeal is made to work together to provide accurate couch top models in planning systems.

Twitter Demographics

The data shown below were collected from the profiles of 4 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 289 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Spain 5 2%
Canada 2 <1%
Brazil 1 <1%
Sweden 1 <1%
Belgium 1 <1%
Ireland 1 <1%
Japan 1 <1%
Serbia 1 <1%
Unknown 276 96%

Demographic breakdown

Readers by professional status Count As %
Researcher 60 21%
Other 43 15%
Student > Master 40 14%
Student > Ph. D. Student 31 11%
Student > Postgraduate 17 6%
Other 50 17%
Unknown 48 17%
Readers by discipline Count As %
Physics and Astronomy 118 41%
Medicine and Dentistry 72 25%
Nursing and Health Professions 14 5%
Engineering 10 3%
Agricultural and Biological Sciences 4 1%
Other 10 3%
Unknown 61 21%

Attention Score in Context

This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 24 August 2017.
All research outputs
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Outputs from Medical Physics
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Outputs of similar age
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Outputs of similar age from Medical Physics
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Altmetric has tracked 23,685,936 research outputs across all sources so far. This one is in the 42nd percentile – i.e., 42% of other outputs scored the same or lower than it.
So far Altmetric has tracked 7,828 research outputs from this source. They receive a mean Attention Score of 3.4. This one is in the 45th percentile – i.e., 45% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 227,893 tracked outputs that were published within six weeks on either side of this one in any source. This one has gotten more attention than average, scoring higher than 52% of its contemporaries.
We're also able to compare this research output to 118 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 77% of its contemporaries.