Table 3 Median and interquartile range (Q1–Q3) of CNR for DSA-ND and DSA-LD using DVA-LD protocols as well as R values for the pelvic, femoral and popliteal, and cruro-pedal region.

From: Radiation exposure reduction in peripheral interventions using digital variance angiography versus conventional angiography

Region

n of ROIs (ND)

CNR DSA-ND

n of ROIs (LD)

CNR DSA-LD

CNR DVA-LD

R values

Pelvic

312

12.8 (8.3–20.7)

316

8.8 (5.0–12.9)

14.4 (6.9–26.9)

1.9 (1.4–2.7)

Femoral & popliteal

536

13.5 (9.0–28.4)

708

6.9 (4.3–12.1)

17.8 (9.2–31.9)

2.4 (1.9–3.2)

Cruro-pedal

492

16.0 (9.8–26.3)

620

7.8 (4.3–13.3)

17.3 (9.2–34.3)

2.4 (1.8–3.3)

  1. Mann-Whitney U test showed significant differences regarding CNR comparison of DSA-ND vs. DSA-LD and DSA-LD vs. DVA-LD (p < .001). CNR differences of DSA-ND vs. DVA-LD were not significant (p = .49, p = .59, p = .15 in pelvic, femoral and popliteal, and cruro-pedal region, respectively).
  2. *R values describe the CNR ratio of DVA-LD/DSA-ND.
  3. CNR contrast-to-noise ratio, DSA digital subtraction angiography, DVA digital variance angiography, DUA digital unsubtracted angiography, ND normal dose, LD low dose.
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