Treatment verification by portal films in chest and mantle field irradiation

C. Fiorino, C. Uleri, A. Bolognesi, A. Rosso, G. M. Cattaneo, E. Villa, R. Calandrino

Research output: Contribution to journalArticle

Abstract

The results of a portal film investigation regarding patients treated for lung tumors and Hodgkin's lymphoma with 6 and 18 MV X-Rays (from 6/100 and 1800 Clinac Varian) are reported. 150 portal films and 68 simulation films of 68 patients (anterior-posterior (AP) fields) have been collected and analyzed evaluating cranio-caudal and lateral shifts, comparing the patient positioning during therapy with respect to the set-up during simulation. Fields have been divided in 'complex' and 'non-complex' ones: we considered as 'complex' ones the mantle fields for the treatment of Hodgkin's disease and the lung-mediastinum fields which included in the treatment volume the supraclavicular nodes, having a complex 'quasi-mantle' shape. 'Non complex' ones were the fields irradiating the mediastinum and portions of lungs, without including supraclavicular nodes. Mean discrepancies and standard deviations have been respectively -0.1 and 3.6 mm for cranio-caudal shifts and -0.8 and 3.1 mm for lateral shifts. Non complex fields showed a standard deviation not significantly different from that of complex fields. Among the considered patients treated for lung diseases, 8 had CT-based treatment planning. For these patients, all treated with 18 MV X-Rays (except one treated with 6 MV X-Rays), exit dose distributions on the central axial slice have been measured by portal film exit dosimetry (Kodak X-Omat V in localization cassette) and compared with those calculated by our treatment planning system (Cadplan Dosetek Varian), with and without applying inhomogeneity correction algorithms (Batho and Equivalent TAR (ETAR)). Off-axis exit doses in the region corresponding to the lungs have been considered in order to assess an index of accuracy in the calculation of the treatment planning. Results show a mean deviation of -11.5% (σ = 7.4%) between calculated and measured relative exit doses (% (calculated-measured)/calculated) when calculating dose distributions without inhomogeneity correction; of -2.5% (σ = 4.4%) when using the Batho algorithm; of +0.3% (= 2.9%) when using Equivalent TAR algorithm. The study confirms the wide dosimetric possibilities of portal film in-vivo dosimetry (especially in the area of verification of the treatment and of treatment planning systems).

Original languageEnglish
Pages (from-to)67-74
Number of pages8
JournalPhysica Medica
Volume11
Issue number2
Publication statusPublished - 1995

Fingerprint

chest
Earth mantle
Thorax
lungs
irradiation
planning
mediastinum
dosage
Lung
X-Rays
Mediastinum
Therapeutics
dosimeters
Hodgkin Disease
standard deviation
shift
inhomogeneity
deviation
Film Dosimetry
x rays

Keywords

  • in-vivo dosimetry
  • portal films
  • quality assurance in radiotherapy
  • treatment verification

ASJC Scopus subject areas

  • Biophysics
  • Physics and Astronomy(all)

Cite this

Fiorino, C., Uleri, C., Bolognesi, A., Rosso, A., Cattaneo, G. M., Villa, E., & Calandrino, R. (1995). Treatment verification by portal films in chest and mantle field irradiation. Physica Medica, 11(2), 67-74.

Treatment verification by portal films in chest and mantle field irradiation. / Fiorino, C.; Uleri, C.; Bolognesi, A.; Rosso, A.; Cattaneo, G. M.; Villa, E.; Calandrino, R.

In: Physica Medica, Vol. 11, No. 2, 1995, p. 67-74.

Research output: Contribution to journalArticle

Fiorino, C, Uleri, C, Bolognesi, A, Rosso, A, Cattaneo, GM, Villa, E & Calandrino, R 1995, 'Treatment verification by portal films in chest and mantle field irradiation', Physica Medica, vol. 11, no. 2, pp. 67-74.
Fiorino C, Uleri C, Bolognesi A, Rosso A, Cattaneo GM, Villa E et al. Treatment verification by portal films in chest and mantle field irradiation. Physica Medica. 1995;11(2):67-74.
Fiorino, C. ; Uleri, C. ; Bolognesi, A. ; Rosso, A. ; Cattaneo, G. M. ; Villa, E. ; Calandrino, R. / Treatment verification by portal films in chest and mantle field irradiation. In: Physica Medica. 1995 ; Vol. 11, No. 2. pp. 67-74.
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