La radioterapia stereotassica con acceleratori lineari. Considerazioni dosimetriche sui collimatori e sull'energia di fasci di fotoni.

Translated title of the contribution: Stereotactic radiotherapy with linear accelerators. Dosage considerations on collimators and photon beam energy

A. B. Somigliana, S. Filice, C. Stucchi, A. Gramaglia, S. Villa, C. Pasqualotto, A. Brusa, M. Crippa, D. Casolino, M. Scorsetti

Research output: Contribution to journalArticlepeer-review

Abstract

The small X-ray beam profiles produced by linear accelerators and used in stereotactic radiosurgery were studied. Circular focusing and not-focusing beams outlined by additional collimators (diameter ranging 10 to 30 mm) and square field outlined by the jaws (field size 10 to 30 mm) were measured. 6 and 18-MV X-ray beams from a dual energy accelerator and 6 and 15-MV X-ray beams produced by 2 single-energy accelerators were used. Measurements were carried out with Kodak X Omat V films in a perspex phantom in the same conditions for all the fields. To study the profile characteristics we introduced the V80/V20 = (R80/R20)3 ratio where R80 and R20 are respectively the mean distance of the 80% and 20% isodose lines from the beams axis. Measurement results show that 6-MV X-ray beams have a higher V80/V20 ratio than the ones obtained with the other energies. There is no significant difference between the beams produced with focused collimators and those produced with not-focused collimators. Square fields outlined by the jaws have a V80/V20 ratio greatly dependent on the accelerator used. This ratio is generally worse than the ones obtained with beams outlined by additional collimators.

Translated title of the contributionStereotactic radiotherapy with linear accelerators. Dosage considerations on collimators and photon beam energy
Original languageItalian
Pages (from-to)692-694
Number of pages3
JournalRadiologia Medica
Volume89
Issue number5
Publication statusPublished - May 1995

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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