Dear friends,
In abdominal CT images, the colon distension is classified in to 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. For measuring different colon segments, which image plane/view and along which axis in patient coordinate system is used?
3. Does this grading size remain same across all the CT slices? or can it vary?
Thanks & regards,
- Manjunath
Dear Manjunath,
Question 1: One approach to classify collapse magnitude would be to:
1. Segment colon and possibly small bowel
2. Extract center line of every segmented connex component and sum every pieces of the centerlines
3. Convert centerline length from voxel number to mm according to voxel size
4. compare last computed length in mm to some ground truth or count the number of connex components
Question 2: Ideal situation would be to make image isotropic first then referential and voxel geometry will not be an issu
Question 3: As far as I understand, grading is a global index; therefore not depending on slices but considering your image as a whole.
I hope this helps,
Hubert,
Dear Hubert,
Thank you for the answer. If I am not wrong, your answer to my first question explains about measuring the length of the intestine.
I am specifically interesed to know the distention grading measurement values for ascending and descending colon in the lateral direction and for transverse colon in the superior to inferior direction in patient coordinate system. There should be some measurement standard which should say, if the ascending colon is measured more than 3 cm in lateral direction, then it is fully distended. I want to know this measurement value.
- Manjunath
- Badges
- Science topic
- Similar topics
- Biological Science
- Histology