Article Figures & Data
Figures
- Fig 1.
Image quality of angiography by 2 separate readers before (Phase 1) and after (Phase 2) the low-dose angiographic protocol.
- Fig 2.
Representative examples of angiographic images before (A) and after (B) the low-dose angiographic protocol. These are cerebral angiograms of a patient who underwent diagnostic angiography to determine the cause of perimesencephalic subarachnoid hemorrhage.
- Fig 3.
Boxplots of fluoroscopic time, DAP, AK, and image frames for diagnostic and therapeutic procedures before (Phase 1) and after (Phase 2) the low-dose angiographic protocol. Thick horizontal lines indicate median values, and diamonds indicate mean values.
Tables
- Table 1:
Mean image quality of angiography by 2 separate readers before and after the low-dose angiographic protocol
Reader 1 Reader 2 Phase 1 4.94 ± 0.32 4.91 ± 0.33 Phase 2 4.95 ± 0.32 4.94 ± 0.23 - Table 2:
Mean and third quartile results for fluoroscopic time, DAP, AK, and image frames for diagnostic and therapeutic procedures before and after the low-dose angiographic protocol
Fluoroscopic Time (min) DAP (Gy×cm2) AK (Gy) Image Frames Diagnostic Phase 1 Mean 13.0 ± 7.9 140.8 ± 48.1 1.02 ± 0.42 251.2 ± 72 3rd quartile 14.4 160.8 1.18 273 Phase 2 Mean 11.9 ± 6.9 82.0 ± 30.0 0.61 ± 0.33 222.6 ± 52 3rd quartile 13.8 94.1 0.69 246 P value .012 <.001 <.001 <.001 Therapeutic Phase 1 Mean 53.5 ± 34.1 246.0 ± 148.3 3.67 ± 2.66 287.6 ± 150 3rd quartile 64.5 301.4 4.42 341 Phase 2 Mean 49.1 ± 32.2 169.8 ± 111.6 3.31 ± 3.21 260.2 ± 128 3rd quartile 60.0 206.2 4.24 334 P value .237 <.001 .291 .080 - Table 3:
Summary of mean and third quartile data of DAP, fluoroscopic time, and number of image frames acquired during diagnostic cerebral angiography for intracranial aneurysms
Reference No. of Patients DAP (Gy×cm2) Fluoroscopy Time (min) No. of Frames Mean 3rd Quartile Mean 3rd Quartile Mean 3rd Quartile Phase 1 506 140.8 160.8 13.0 14.4 251.2 273 Phase 2 540 82.0 94.1 11.9 13.8 222.6 246 Hassan and Amelot17 398 43.1 59.7 5.6 7.5 245 314 Chun et al6 439 136.6 154.2 12.6 14.0 251 273 D'Ercole et al18 100 142.1 180 9.9 12.3 220 317 Aroua et al19 91 121 125 12.6 15 679 480 Verdun et al20 91 107 124 Brambilla et al21 188 158 198 13.7 17.5 - Table 4:
Summary of mean and third quartile data of DAP, fluoroscopic time, and number of image frames acquired during therapeutic cerebral angiography for intracranial aneurysms
Reference No. of Patients DAP (Gy×cm2) Fluoroscopy Time (min) No. of Frames Mean 3rd Quartile Mean 3rd Quartile Mean 3rd Quartile Phase 1 144 246.0 301.4 53.5 64.5 287.6 341 Phase 2 173 169.8 206.2 49.1 60.0 260.2 334 Hassan and Amelot17 71 78.7 111.9 25.7 34.8 300 428 Chun et al6 111 226.0 272.8 52.9 61.1 241 276 D'Ercole et al18 72 382.2 487 37.2 46.3 558 717 Aroua et al19 52 335 440 36.5 50 760 800 Verdun et al20 58 335 352 Brambilla et al21 356 319.9 87.1 1053 - Table 5:
The proportion of DAP contributed by rotational angiography before and after the low-dose protocola
Phase 1 Phase 2 Diagnostic Total DAP (Gy×cm2) 140.8 ± 48.1 82.0 ± 30.0 Rotation DAP (Gy×cm2) 26.3 ± 13.4 28.0 ± 13.7 Rotations/total DAP 18.7 % 34.1 % No. of rotations 1.49 ± 2.60 1.44 ± 0.68 Therapeutic Total DAP (Gy×cm2) 246.0 ± 148.3 169.8 ± 111.6 Rotation DAP (Gy×cm2) 30.8 ± 17.0 25.6 ± 14.3 Rotations/total DAP 12.5 % 15.1 % No. of rotations 1.58 ± 0.79 1.33 ± 0.68 ↵a Data are means and percentages.
