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Fig. 5 —Graph shows trigger delays found using FREEZE and using visual
assessment. In two subjects, volume-targeted navigator-gated and
navigator-corrected double oblique 3D segmented k-space gradient-echo imaging
was performed (3 T, TR/TE = 4.3/1.47, 
= 20°, resolution = 0.7
x 1 x 3 mm, field of view = 360 x 270 mm, 512 x 268
matrix, 16 radiofrequency excitations per R-R interval, acquisition time
window [Tacq] = 69 milliseconds, bandwidth = 362 Hz/pixel, scan
duration = 145-259 seconds depending on navigator efficiency and heart rate,
10 slices [acquired], 20 slices [reconstructed using zero filling], fat
saturation, adiabatic T2 prepulse [TE = 50 milliseconds]). FREEZE found
end-systolic trigger delay (arrows), whereas visual inspection led to
diastolic acquisition interval in same subjects.