Home About us Editorial board Ahead of print Current issue Search Archives Submit article Instructions Subscribe Contacts Login 
Year : 2012  |  Volume : 8  |  Issue : 4  |  Page : 528-531

Dose verification to cochlea during gamma knife radiosurgery of acoustic schwannoma using MOSFET dosimeter

1 Radiological ­Physics and Advisory ­Division, Bhabha Atomic ­Research Centre, CTCRS Building, Anushaktinagar, ­Mumbai, India
2 Gamma Knife Centre, P. D. Hinduja, National Hospital and ­Medical Research Centre, VS Marg, Mahim, ­Mumbai, India

Correspondence Address:
Sunil D Sharma
Radiological Physics and Advisory Division, Bhabha Atomic ­Research Centre, CTCRS Building, Anushaktinagar, ­Mumbai - 400 094
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0973-1482.106528

Rights and Permissions

Aim: Dose verification to cochlea using metal oxide semiconductor field effect transistor (MOSFET) dosimeter using a specially designed multi slice head and neck phantom during the treatment of acoustic schwannoma by Gamma Knife radiosurgery unit. Materials and Methods: A multi slice polystyrene head phantom was designed and fabricated for measurement of dose to cochlea during the treatment of the acoustic schwannoma. The phantom has provision to position the MOSFET dosimeters at the desired location precisely. MOSFET dosimeters of 0.2 mm x 0.2 mm x 0.5 μm were used to measure the dose to the cochlea. CT scans of the phantom with MOSFETs in situ were taken along with Leksell frame. The treatment plans of five patients treated earlier for acoustic schwannoma were transferred to the phantom. Dose and coordinates of maximum dose point inside the cochlea were derived. The phantom along with the MOSFET dosimeters was irradiated to deliver the planned treatment and dose received by cochlea were measured. Results: The treatment planning system (TPS) estimated and measured dose to the cochlea were in the range of 7.4 - 8.4 Gy and 7.1 - 8 Gy, respectively. The maximum variation between TPS calculated and measured dose to cochlea was 5%. Conclusion: The measured dose values were found in good agreement with the dose values calculated using the TPS. The MOSFET dosimeter can be a suitable choice for routine dose verification in the Gamma Knife radiosurgery.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded147    
    Comments [Add]    

Recommend this journal