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A study of dosimetric characteristics for in vivo dosimetry with cylindrical n-type Isorad diode

  • Kashif Islam (a1), Asdar Haque (a2), Khan Muhammad (a3), Sohail Murad (a4), Muzaffar Hussain (a2), Asma Ashfaq (a5) and Atif Islam (a6)...

Abstract

Background and purpose

The objective was to determine diode characteristics before actual dose verification on human phantom and patients.

Materials and methods

The reliability and stability of equipment, signal stability, precision, dose response linearity, field flatness, perturbation of radiation dose, plastic to water conversion factor (Kpl), ionisation chambers (ICs) and diode calibration were determined. Correction factors for tray (CFtray), wedge (CFwedge), field size (CFFS), SSD (CFSSD), angle (CFangle) and block (CFblock) were found. Patient dose monitor, Isorad diode (n-type) and IC (PTW Frieburg), Co-60 unit (Theratron), ATOM Adult male human phantom (Model 701-D, CIRS) were used.

Results and conclusion

Good signal stability, precise data, and linear dose response, variation of 0·500% and 5·000% in field flatness and perturbation tests, respectively, were noted. Kpl was 1·006 for IC PTW Frieburg TW30013, 0114. The diode calibration factor was 0·989. CFtray, CFFS, CFSSD, CFangle, CFblock were 1·001, 1·001, 0·997, 1·006 and 0·990, respectively. CFwedge were 1·024, 1·030 and 1·038 for 30°, 45° and 60° wedges, respectively. The verification of above correction factors (CFs) on Nasopharynx and lung of human phantom was also done.

Copyright

Corresponding author

Correspondence to: Kashif Islam, Gujranwala Institute of Nuclear Medicine & Radiotherapy (GINUM), Nizam Pur, Sialkot Road, Gujranwala, Pakistan. Tel: 92-333-8102831; Office: 92-55-3493370-72 ext 3083. Fax: 92-055-3493379. E-mail: Kashif_iislam@hotmail.com

References

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A study of dosimetric characteristics for in vivo dosimetry with cylindrical n-type Isorad diode

  • Kashif Islam (a1), Asdar Haque (a2), Khan Muhammad (a3), Sohail Murad (a4), Muzaffar Hussain (a2), Asma Ashfaq (a5) and Atif Islam (a6)...

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