Table 2.
Computerized tomography based blocks | Magnetic resonance imaging based blocks | |
Time for study | Lesser (approximately 5 min) | Longer (approximately 45 min) |
Cost | Economical | Costlier |
Radiation exposure | Uses ionizing radiation. But focused hip-knee-ankle computerized tomography scanogram reduces exposure to 5 mSv (equal to yearly background exposure) | Does not use ionizing radiation |
Availability | Easily available | Not available at all centers |
Patient turn over | Useful for high patient turnover centers | Not suitable for high patient turnover center |
Contraindication | Can be used in patient with any metal prosthesis in situ | Cannot be used in patient with metal prosthesis or cardiac pacemaker in situ |
Based on | Bony landmarks | Cartilage |
Accuracy | Comparable | Comparable |
Initial infrastructure set up cost | Lower as compared to MRI | High, non affordable for low volume centres |
Claustrophobia | No contraindication | Can not be performed in claustrophobic patients |
MRI: Magnetic resonance imaging.