Dear friends,
In abdominal CT images, the distension of large intestine is classified in G0 (completely collapsed), G1 (partial collapse), G2 (sub optimal distension) and G3 (optimally distended). I want to know,
1. What is the measurement in mm, for classifying in to above categories.
2. Is this measurement done manually using distance measurement tool on axial slices?
3. For one colon segment, lets say ascending or descending part, does this grading size remain same across all the slices? or can it vary?
4. How are the transverse and sigmoid colon distensions are measured (using which MPR view)?
Can you please provide some source of information about colon grading. I could not find anything anywhere in internet.
- Manjunath
Dear Manjunath, could you please quote the source or originator of the G0-G3 classification method you mentioned above? This will enable me to investigate how they did it and thus be in a better position to help you.
Thank you.
At our institution we use the following grading scale for colonic distention for CT colonography: distention was measured per colonic segment (six segment model). We estimated the distention % were 100% is the maximum possible distention for that segment. We rated distention on a 4 point scale, based on the worst distended part of the segment. 1= very poor (75% distended). When you have 2 insufflation positions, use the best segment score of the two positions. We provide examples in that article. (MC HAAN et al. EJR 2012)
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