Use of a dynamic rangeshifter for modifying the depth‐dose distributions of negative pions

Amols, Howard; Liska, D.J.; Halbig, J.K.

doi:10.1118/1.594313

Cited by 22 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Typical isodose profiles with the 4 cm collimator are shown in fig. Approximately 8% of the dose at the peak was the result of muon and electron contamination (Amols et al 1976).…”

Section: Methodsmentioning

confidence: 99%

“…The Rossi chamber was filled to a pressure of 34 Torr for all measurements, and thus simulated a sphere of 2 pm diameter in unit density material. Further details may be found elsewhere (Amols, Dicello and Lane 1976).…”

Section: Methodsmentioning

confidence: 99%

“…From these data we can estimate the total dose from the primary beam at large distances off beam centre by assuming that the dose is proportional to the fluence. Accurate dose measurements on beam centre are available from previous measurements (Amols et al 1976). Measurements of room background radiation were made with a Bonner sphere, and this component of the dose proved to be negligible ; therefore, the total dose should be equal to the sum of the primary dose plus the neutron dose.…”

Section: Uncollimated Beammentioning

confidence: 99%

“…The tumours treated in these studies were subcutaneous metastatic lesions which varied in size from about 0.5 to 2-0 cm in diameter and extended from the skin surface to about 1.0 cm depth. The beam used to treat these nodules was shaped appropriately and the dosimetric and microdosimetric properties of the beam were studied in detail (Dicello, Amols, Lane, Lundy, Doss, Knowles and Barnes 1975, Amols, Dicello and Lane 1976, Richman 1976.…”

Section: Introductionmentioning

confidence: 99%

“…Recently larger treatment volumes have been developed (Amols, Liska andHalbig 1977, Paciotti, Bradbury, Knapp, Hutson, Rivera andLaubacher 1977) and are being used for patient treatments at LAMPF (Smith et al 1977, Kligerman, Smith, Yuhas, Wilson, Sternhagen, Helland andSala 1977), although studies have continued on smaller treatment volumes as described here. Nearly one dozen patients have been treated with this or similar beams.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dose outside the treatment volume for irradiation with negative pions

Amols

Bradbury

Dicello

et al. 1978

pmb

View full text Add to dashboard Cite

Irradiation of humans with negative pions requires a knowledge of the absorbed dose and radiation quality outside the primary pion beam. In conjunction with early clinical trials at LAMPF, experimental data have been obtained with microdosimetric techniques and multiwire proportional counters. Theoretical calculations have been made for the neutron contribution to the dose and are consistent with these data. Measurements were made with in 40 cm x 51 cm x 76 cm water phantom for a negative pion beam of initial momentum of 170 MeV/c, deltap = +/- 3MeV/c. The absorbed dose outside the treatment volume is the result of: (1) neutrons and photons from the pion interactions,(2) treatment room background and (3) peripheral muons, electrons and pions in the primary beam. The first two components are nearly isotropic and are congruent to 0.02% of the peak dose at a distance of 24 cm from the treatment volume; the third component is anisotropic and varies from 0.01 to 0.1% of the peak dose. Collimation of the bean increases the dose outside the treatment volume typically by 50%.

show abstract

“…Typical isodose profiles with the 4 cm collimator are shown in fig. Approximately 8% of the dose at the peak was the result of muon and electron contamination (Amols et al 1976).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Uncollimated Beammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations