Article Figures & Data
Figures
- Fig 1.
Topogram of Alderson-Rando-phantom demonstrating scan areas for standard CT of the head (A), CTP (B), as well as intracranial CTA (C), and cervical CTA (D), respectively.
Tables
Standards CT CT Angiography CT Perfusion Base Cerebrum Intracranial Cervical Protocol I Protocol II Protocol III Collimation (mm) 20 × 1.2 20 × 1.2 64 × 0.6 64 × 0.6 20 × 1.2 20 × 1.2 20 × 1.2 Table feed (mm) 24 24 45,9 69,7 0 0 0 Pitch 1 1 1.2 1.8 0 0 0 Tube current (mAseff) 350 300 160 115 270 200 200 Electrical mA 350 300 383 417 270 200 200 Potential (kV) 120 120 100 120 80 80 120 Rot. time (s) 1 1 0.5 0.33 1 1 1 Scan length (mm) 48 95 250 280 24 24 24 Scan time (s) 6.25 4.58 40 40 40 CTDIvol total (mGy) 39.86 34.16 12.79 7.9 432 320 970 DLP total (mGy x cm) 203 348 386 277 1037 768 2330 Note:—Table feed indicates table movement per second. Pitch corresponds to the dose-relevant pitch (table feed per total collimation considering the number of detector rows acquired simultaneously). CTDI indicates computed tomography dose index; DLP, dose–length product.
- Table 2:
Organ doses and effective doses as measured by lithium fluoride thermoluminescent dosimeters in several positions for different scan protocols
Standard CT CT Angiography CT Perfusion Intracranial Cervical Protocol I Protocol II Protocol III Organ doses (mGy) Cerebrum (overall) 22.2 11.7 9.8 117.9 82.5 325.2 Cerebrum (highest dose) 35.2 9.2 10.3 164.9 114.1 444.2 Skin (total) 11.7 3.1 0.7 26.9 20.2 126.9 Skin (highest dose) 36.2 16.1 19.2 112.3 87.2 404.8 Bone marrow (total) 2.2 2.7 4.3 4.2 4.2 20.7 Bone marrow (skull) 15.8 9.9 10 21.4 21.9 118.1 Eye lens 5.4 15.2 13 13.7 7.9 35.7 Thyroid 1.1 19.7 19.2 2.4 2.4 9.2 Esophagus 0.7 4.8 7.5 2.0 1.2 4.7 Lung 0.4 0.6 4.0 0.7 0.4 1.0 Gonads 0.2 0.3 0.2 0.2 0.2 0.2 Effective dose (mSv)* 1.7 1.9 2.8 1.2/1.3 1.1/1.2 5.0 * Data for effective doses are given for male and female subjects if different (male/female).
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