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Modern Accelerators for Radiotherapy. A Critical Review

Maciszewski W., Scharf W.

Eksploatacja i Niezawodność

2003

nr 4

4-16

The paper describes the development of the application of particle accelerators in the treatment of cancer diseases over the past fifty years. Special emphasis is put on the routine application of conventional electron accelerators delivering electron and photon beams. This is the largest group of devices for radiotherapy (over 7500 machines operating worldwide). The number of patients reaches 5 million per year. The medical electron linacs have recently undergone considerable modifications of construction, in particular the systems of radiation field shaping. Contemporary accelerators for radiotherapy are equipped with dynamic multileaf collimators (MLC) which, in conjunction with 1MRT (Intensity Modulation Radiation Therapy) technique and special system of therapy planning, assure considerably higher precision, effectiveness and quality of treatment. Recent applications of hadronic particles, such as protons and heavy ions, are mentioned in the paper, too.

The photon beam characteristics of linear accelerator equipped with additional narrow beam collimator

Wysocka A., Maciszewski W.

Nukleonika

2001

Vol. 46, nr 3

91-93

In this paper a laboratory set-up with an electron linac installed in this Institute, and an attached narrow-beam collimator for photon beam are presented. Characteristics of the circular photon beams of diameters ranging from 10 to 30 mm at the isocentre are reported. The specific quantities measured include: relative output factors, beam profiles (off axis factors), and a central axis attenuation of beams. Measurements of these parameters were performed in a water phantom using small cylindrical ionisation chambers.