select roi on the circle

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Latifa Bouguessaa
Latifa Bouguessaa 2022-6-21
评论： Image Analyst 2022-6-23
Good day,
I hope someone can help me here.
I have a phantom CT image and want to select the objects (Roi). The objects are on a circle. Is there a way to convert this ROI to Cartesian coordinates. many thanks and best regards

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回答（2 个）

Image Analyst
Image Analyst 2022-6-21
Looks like you could simply create a mask using the code in the FAQ:
https://matlab.fandom.com/wiki/FAQ#How_do_I_create_a_circle?
Latifa Bouguessaa
Latifa Bouguessaa 2022-6-22
Hello,
Thank you Sulaymon Eshkabilov and Image Analyst for your answer.
I have now segmented my phantom on the picture and determined the center of the phantom. but I couldn't cut the desired area (roi) on the picture.
I need to select an arc with Radius1=45 and Radius2=55 on the image. The center of the phantom has the coordinates X= 259 and y=252.
can someone help me??
Best regards
  1 个评论
Image Analyst
Image Analyst 2022-6-23
Why do you need to cut it out (crop it)? That's probably not necessary. If you do you can do this
props = regionprops(mask, 'BoundingBox');
croppedImage = imcrop(grayImage, props.BoundingBox);

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