There are multiple definitions:

1. cardiothoracic ratio(English)

   • heart size measured in relation to the total thoracic width; also as CTI
   • CTI, HW/TL
   • Cardiology, Radiology, Ratio-based metric
   • https://www.rad…t_anatomy_page8

2. capsular tension ring(English)

   • implantation can benefit cataract patients with weak zonules by maintaining the shape of the capsular bag, reducing capsule shrinkage and stabilizing IOL inclination
   • IOL, PPV, UDVA, BCDVA, AL, CBDm
   • Ophthalmology, Surgery
   • https://doi.org…886-020-01772-8
   • https://doi.org…3350(99)00204-7

3. crest time ratio(English)

   • CT, MSE, MSELS
   • Hemodynamics, Diabetes, Ratio-based metric
   • https://doi.org…1517-014-1220-4

4. carpal tunnel release(English)

   • CTS, BCTQ
   • Musculoskeletal system
   • https://doi.org…54.2022.2100783