Article Figures & Data
Figures
- Fig 1.
MRA technique sensitivity for any aneurysm remnant, larger (class 3 or 4) remnants, and the detection of growth since previous DSA; 95% confidence intervals are shown.
- Fig 2.
MRA technique specificity for any aneurysm remnant, larger (class 3 or 4) remnants, and the detection of growth since previous DSA; 95% confidence intervals are shown.
- Fig 3.
DSA (A), 3T TOF-MRA MIP (B), 3T CE-MRA MIP (C), 3T TOF-MRA source image (D), and 3T CE-MRA source image (E). A class 4 coiled anterior communicating artery remnant/recurrence (white arrows in A, B, and C) is better depicted as a large remnant with CE-MRA (C) than with TOF-MRA (B). Digitally subtracted coils are seen in A (black arrows). However, by using our clinical scanning protocols, localization of the coil mass is improved with TOF-MRA (D, white arrow) relative to CE-MRA (E). This may be related to better visualization of the surrounding brain tissue with TOF than with CE-MRA because of a shorter TR and higher flip angle of the CE-MRA and a longer TE with TOF-MRA.
Tables
1.5T TOF 1.5T CE 3T TOF 3T CE TE 6.9 Minimum 3.4 Minimum TR 36 6.6 38 8.6 Flip angle 25° 45° 25° 40° Sequence TOF SPGR Fast TOF SPGR TOF SPGR Fast TOF SPGR Matrix/NEX 256/224/1 256/224/1 512/256/1 416/224/1 Nominal section thickness (mm) 1.4 (3 slabs) 1.2 1.4 (3 slabs) 1.2 Zero-fill interpolation Yes Yes Yes Yes LOC/overlap 32/6 48 32/6 48 FOV (cm) 18 22 18 22 Receiver bandwidth (± kHz) 16 32 16 32 MRA Technique P Value Comparing Sensitivities P Value Comparing Specificities Aneurysm class: 1 vs 2 ,3, 4 (for any remnant) 1.5 TOF vs 1.5 CE .3173 .1797 1.5 TOF vs 3 TOF .3173 1 1.5 TOF vs 3 CE 1 .2568 1.5 CE vs 3 TOF .3173 .1797 1.5 CE vs 3 CE .4142 1 3 TOF vs 3 CE 1 1 Aneurysm class: 1, 2 vs 3, 4 (for larger remnants) 1.5 TOF vs 1.5 CE .0455 1 1.5 TOF vs 3 TOF 1 1 1.5 TOF vs 3 CE .0455 .5637 1.5 CE vs 3 TOF .1025 1 1.5 CE vs 3 CE 1 .5637 3 TOF vs 3 CE 1 1 Aneurysm occlusion: better or same vs worse 1.5 TOF vs 1.5 CE 1 .6547 1.5 TOF vs 3 TOF .3173 .3173 1.5 TOF vs 3 CE .1573 .5637 1.5 CE vs 3 TOF .3173 .5637 1.5 CE vs 3 CE .1573 1 3 TOF vs 3 CE .3173 .5637
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