Tags

Type your tag names separated by a space and hit enter

Dose measurement of cobalt-60 radiotherapy beams in treatment fields.
J Ayub Med Coll Abbottabad 2014 Jul-Sep; 26(3):279-82JA

Abstract

BACKGROUND

Radiation-therapy is a complex process with multiple steps, each of which has an impact on the quality of treatment. Accurate dosimetry is a critical step during the radiotherapy of cancer patients.The aim of the present study was to measure and evaluate the doses of two cobalt- 60 (60Co) teletherapy units GWXJ80 of NPIC China and Theratron 780 of AECL Canada at various points within fields for different field sizes.

METHODS

This cross-sectional descriptive study was done to measure the 60Co doses in the treatment fields.The dose measurements were done in air and 30x30x30 cm3 Phantom at 80 cm SSD by using calibrated NE 2570 Farmer Electrometer & NE 2571 Farmer Ionization Chamber and percentage of doses were calculated.

RESULTS

The results showed that 60% central area of all fields ranging from 100-98.79% and 100-96.12% for GWXJ80 in the air and phantom, whereas for Theratron 780, they were ranging from 100-98.50% and 100-96.45% in air and phantom respectively. The percentages of doses at the edges for GWXJ80 and Theratron 780 in the air were 75.39-38.66% & 85.65-46.47% respectively and they were 82.22-40.39% & 49.05-24.55% respectively in phantom.

CONCLUSIONS

The doses within 60% central area of fields in air were higher than phantom for both teletherapy units. The doses at field edges in air were lower in GWXJ80 than Theratron 780 whereas in phantom they were vice versa. But all were in the acceptable range as recommended by International Commission on Radiation Units and Measurements.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25671926

Citation

Memon, Sajjad Ahmed, et al. "Dose Measurement of Cobalt-60 Radiotherapy Beams in Treatment Fields." Journal of Ayub Medical College, Abbottabad : JAMC, vol. 26, no. 3, 2014, pp. 279-82.
Memon SA, Cheema AA, Laghari NA, et al. Dose measurement of cobalt-60 radiotherapy beams in treatment fields. J Ayub Med Coll Abbottabad. 2014;26(3):279-82.
Memon, S. A., Cheema, A. A., Laghari, N. A., & Mangi, F. H. (2014). Dose measurement of cobalt-60 radiotherapy beams in treatment fields. Journal of Ayub Medical College, Abbottabad : JAMC, 26(3), pp. 279-82.
Memon SA, et al. Dose Measurement of Cobalt-60 Radiotherapy Beams in Treatment Fields. J Ayub Med Coll Abbottabad. 2014;26(3):279-82. PubMed PMID: 25671926.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dose measurement of cobalt-60 radiotherapy beams in treatment fields. AU - Memon,Sajjad Ahmed, AU - Cheema,Asrar Ahmad, AU - Laghari,Naeem Ahmed, AU - Mangi,Fayaz Hussain, PY - 2015/2/13/entrez PY - 2015/2/13/pubmed PY - 2015/3/18/medline SP - 279 EP - 82 JF - Journal of Ayub Medical College, Abbottabad : JAMC JO - J Ayub Med Coll Abbottabad VL - 26 IS - 3 N2 - BACKGROUND: Radiation-therapy is a complex process with multiple steps, each of which has an impact on the quality of treatment. Accurate dosimetry is a critical step during the radiotherapy of cancer patients.The aim of the present study was to measure and evaluate the doses of two cobalt- 60 (60Co) teletherapy units GWXJ80 of NPIC China and Theratron 780 of AECL Canada at various points within fields for different field sizes. METHODS: This cross-sectional descriptive study was done to measure the 60Co doses in the treatment fields.The dose measurements were done in air and 30x30x30 cm3 Phantom at 80 cm SSD by using calibrated NE 2570 Farmer Electrometer & NE 2571 Farmer Ionization Chamber and percentage of doses were calculated. RESULTS: The results showed that 60% central area of all fields ranging from 100-98.79% and 100-96.12% for GWXJ80 in the air and phantom, whereas for Theratron 780, they were ranging from 100-98.50% and 100-96.45% in air and phantom respectively. The percentages of doses at the edges for GWXJ80 and Theratron 780 in the air were 75.39-38.66% & 85.65-46.47% respectively and they were 82.22-40.39% & 49.05-24.55% respectively in phantom. CONCLUSIONS: The doses within 60% central area of fields in air were higher than phantom for both teletherapy units. The doses at field edges in air were lower in GWXJ80 than Theratron 780 whereas in phantom they were vice versa. But all were in the acceptable range as recommended by International Commission on Radiation Units and Measurements. SN - 1025-9589 UR - https://www.unboundmedicine.com/medline/citation/25671926/Dose_measurement_of_cobalt-60_radiotherapy_beams_in_treatment_fields DB - PRIME DP - Unbound Medicine ER -