The 11" x 13" grid is designed to be used with 10" x 12" cassettes.
 
 Specifications: 
  
6:1 ratio 
  
Focal distance 26-32"
  
103 lines per inch
 
 The short S.I.D. of 26-32" makes it more effective with portable x-ray machines. 
 
 Dr. Redden has found that this grid greatly enhances the detail and contrast with venograms and all navicular studies.
 
 A must have for equine podiatrists!