Journal of Medical Physics
 Home | Search | Ahead of print | Current Issue | Archives | Instructions | Subscription | Login  The official journal of AMPI, IOMP and AFOMP      
 Users online: 562  Home  EMail this page Print this page Decrease font size Default font size Increase font size 
Year : 1997  |  Volume : 22  |  Issue : 1  |  Page : 1-5

Computation Of Dose volumes For Intraluminal Brachytherapy Of Oesophagus Using Caesium-137 Pellets



Correspondence Address:
V.K Sathiya Narayanan


Login to access the Email id

Source of Support: None, Conflict of Interest: None


Rights and PermissionsRights and Permissions

The volume of tissue irradiated to a particular dose has been an interesting topic in radiation therapy. However, the shapes of the volume of the isodose surfaces in most of the situations are irregular and hence it is difficult to evaluate their volumes using geometrical methods. The intraluminal application of Ca-oesophagus using caesium-137 pellets presents an isodose surface, the volume of which can be evaluated or computed using basic geometrical principles. The shape of the volume is usually an elongated cylinder with its length larger than its radius and the tip of the cylinder convex in shape. The volume is obtained by a three-step process. In the first step, the ends or the tips of the volume are found. In the second step, the areas of the transverse sections of the slices at regular intervals are computed. In the third step, the areas of the slices are geometrically integrated and the volume enclosed by an isodose surface is obtained. The volume (cm3) of a particular dose rate (DR) evaluated for three source trains containing 7, 8 and 9 sources is given as V - a (DR) p where a and 13 are constants. The relationship obtained in the present study between volume (cm3) and K/D, where K is the total air kerma in mGy per hour at one metre and D is the dose rate in Gy/hr, is given as V - 162.758' (K/D)1.6788'.Thus, a method which gives the absolute volumes enclosed by the isodose surfaces of the intraluminal applications is developed and presented.


[PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

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

 Article Access Statistics
    Viewed579    
    Printed45    
    Emailed0    
    PDF Downloaded96    
    Comments [Add]    

Recommend this journal