<input type="radio" name="IR_Backproj" value="table">Trig Table<br>
<input type="radio" name="IR_Backproj" value="diff">Difference<br>
<input type="radio" name="IR_Backproj" value="diff2">Difference Optimized<br>
<input type="radio" name="IR_Backproj" value="table">Trig Table<br>
<input type="radio" name="IR_Backproj" value="diff">Difference<br>
<input type="radio" name="IR_Backproj" value="diff2">Difference Optimized<br>