E-ISSN 2305-1620 | ISSN 2221-0288
 

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Behaviour of wedges for different field sizes and depths

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi.

Abstract
Background: The relative dosimetry plays vital part in treatment planning of patients. Factors such as percent depth doses, tissue maximum ratios, tray factors, wedge factors, etc., determined from the relative dosimetry, affects the patient dose. The current study intended at measuring and evaluating the wedge factor for different field sizes and depths for 60Co teletherapy unit GWXJ80 of NPIC China. Methods: The measurements for 15o, 30o, 45o and 60o wedges for different field sizes and depths on 60Co teletherapy unit GWXJ80 of NPIC China installed at Nuclear Institute of Medicine and Radiotherapy (NIMRA), Jamshoro, Pakistan, were done in water phantom of 30x30x30 cm3 dimension at 80 cm Source-to-Surface Distance (SSD) by using calibrated Farmerís NE 2570 electrometer with NE 2571 0.6 cc ionization chamber. Results: The evaluation of data showed that there was no significant difference in factor of each of wedge being analyzed for different field sizes and depths. Conclusion: The current study suggests that wedge factor for a particular wedge is approximately a constant value irrespective of field size and depth. The measurement for only one field size at one depth is sufficient to calculate the wedge factor for a particular wedge.

Key words: 60Co, Quality assurance, Relative dosimetry, Field size, Depth.


 
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Pubmed Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. Behaviour of wedges for different field sizes and depths. Pak J Nucl Med. 2017; 7(1): 20-27. doi:10.24911/PJNMed.7.4


Web Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. Behaviour of wedges for different field sizes and depths. http://www.pjnmed.com/?mno=302234 [Access: November 17, 2018]. doi:10.24911/PJNMed.7.4


AMA (American Medical Association) Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. Behaviour of wedges for different field sizes and depths. Pak J Nucl Med. 2017; 7(1): 20-27. doi:10.24911/PJNMed.7.4



Vancouver/ICMJE Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. Behaviour of wedges for different field sizes and depths. Pak J Nucl Med. (2017), [cited November 17, 2018]; 7(1): 20-27. doi:10.24911/PJNMed.7.4



Harvard Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi (2017) Behaviour of wedges for different field sizes and depths. Pak J Nucl Med, 7 (1), 20-27. doi:10.24911/PJNMed.7.4



Turabian Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. 2017. Behaviour of wedges for different field sizes and depths. Pakistan Journal of Nuclear Medicine, 7 (1), 20-27. doi:10.24911/PJNMed.7.4



Chicago Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. "Behaviour of wedges for different field sizes and depths." Pakistan Journal of Nuclear Medicine 7 (2017), 20-27. doi:10.24911/PJNMed.7.4



MLA (The Modern Language Association) Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi. "Behaviour of wedges for different field sizes and depths." Pakistan Journal of Nuclear Medicine 7.1 (2017), 20-27. Print. doi:10.24911/PJNMed.7.4



APA (American Psychological Association) Style

Sajjad Ahmed Memon, Naeem Ahmed Laghari, Fayaz Hussain Mangi (2017) Behaviour of wedges for different field sizes and depths. Pakistan Journal of Nuclear Medicine, 7 (1), 20-27. doi:10.24911/PJNMed.7.4





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