Parathyroid (4D CT) PRINT
Last updated: 2/20/2021.
What changed: N/A
History: Parathyroid adenoma, hypercalcemia.
| PARATHYROID (4D) | ||||||
|---|---|---|---|---|---|---|
| Localizer | Frontal and Lateral | |||||
| Scan | Neck | Neck | Neck | |||
| Phase | Non-contrast | Arterial | Venous | |||
| Patient Instruction | Do not swallow | |||||
| Contrast agent | 350-370. Inject RIGHT arm. | - | ||||
| Volume/ rate | 75 mL @ 4 mL / sec | - | ||||
| Contrast Delay | 25 sec from start of injection | 80 sec from start of injection | ||||
| Coverage | Hyoid bone to Clavicular Heads | Mandible to Carina | Mandible to Carina | |||
| Scan type | Helical | Helical | Helical | |||
| kVp | 110-130 | 110-130 | 110-130 | |||
| Target CTDIvol (mGy) | <15 | <15 | <15 | |||
| Max CTDIvol (mGy) | 25 | 35 | 25 | |||
| Max scan time (sec) | 20 | 35 | 35 | |||
| Pitch | 0.9-1.5:1 | |||||
| DFOV | 20-22 | |||||
| SEND TO PACS (ALL PHASES) | ||||||
| Ax: 0.6-1 mm Standard | ||||||
| Sag: 2.5 mm Standard | ||||||
| Cor: 2.5 mm Standard | ||||||
Key tips:
- Inject right arm to reduce artifact. Inject 75 mL contrast at 4 mL / sec then saline bolus chase.
- 4D Parathyroid scan to be ordered by a endocrinologist or specialized thyroid surgeon.