Dose reduction in entrance surface dose rate (with backscatter) measured with a PMMA phantom
| Low-Mode Fluoroscopy (mGy/min) | Normal-Mode Fluoroscopy (mGy/min) | DSA (mGy/image) | |
|---|---|---|---|
| Normal dose (15 p/s in fluoro.) procedure | 9.9 | 25.2 | 5.9 |
| Low-dose (7.5 p/s in fluoro.) procedure | 7.0 | 16.6 | 3.1 |
| Dose reduction % (low dose/normal dose) | 30 | 34 | 47 |
Note:—PMMA indicates polymethylmethacrylate. Focus-phantom distance: 67 cm; Focus image detector; 104 cm. 20-cm thickness of PMMA; FOV 31.1 cm. The dose per pulse in the new low-dose fluoroscopy mode has been increased in comparison with the “normal” one to reduce the noise.