BIDS validator error "SLICETIMING_ VALUES_ GREATER_ THAN_ REPETITION_ TIME"

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1

Hi there,

I am getting the above mentioned errors simultaneously and here is my json file for one scan. I checked this related post here but my problem seems to be another one. Do you know what might be the issue?

"RepetitionTime": 2,
"SliceTiming": [0,0,0,0,0,0,0,0,1.01,0.03,0.02,0,0,0.14,1.44,0.64,0,0,0,0,0,0.64,0.8,0.64,1.01,0.03,0.02,0,0,0.08,1.45,0.64,0,0,0,0,0,2.24,0.95,0.64,0,0,0,0,0,0.12,1.46,0.64,0,0,0,0,0,0.16,1.04,0.64,0,0,0,0,0,0.06,1.47,0.64,0.5,1.75,0.02,0,0,0.24,1.12,0.64,0,0,0,0,0,0.1,1.48,0.64,0.5,1.75,0.02,0,0,0,1.16,0.64,0,0,0,0,0,0.14,1.49,0.64,0.5,1.75,0.02,0,0,0.16,1.2,0.64,0,0,0,0,0,0.08,1.5,0.64,0.5,1.75,0.02,0,0,0.32,1.24,0.64,2.04,1.71,0,0,0,0.12,1.51,0.64,1.53,0.87,0.01,0,0,0.04,1.28,0.64,2.04,1.71,0,0,0,0.16,1.52,0.64,1.53,0.87,0.01,0,0,0.12,1.3,0.64,2.04,1.71,0,0,0,0.1,1.53,0.64,0.5,1.75,0.02,0,0,0.2,1.32,0.64,2.04,1.71,0,0,0,0.14,1.54,0.64,0.5,1.75,0.02,0,0,0.08,1.34,0.64,2.04,1.71,0,0,0,0.18,1.55,0.64,0.5,1.75,0.02,0,0,0.16,1.36,0.64,2.04,1.71,0,0,0,0.12,1.56,0.64,0.5,1.75,0.02,0,0,0.24,1.38,0.64,1.53,0.87,0.01,0,0,0.16,1.57,0.64,0.5,1.75,0.02,0,0,0.12,1.4,0.64,1.53,0.87,0.01,0,0,0.2,1.58,0.64,0.5,1.75,0.02,0,0,0.2,1.42,0.64],

The issue is that the slicetiming is not greater than the TR. Should I look into other parameters or key-values to check? Thanks a bunch!

2

Hi @ClaireZ,

I see a value of 2.04 in your slice timing vector, which is more than your TR.

Best,
Steven

3

Those slice timing values do not look plausible. While multi-band sequences do have multiple slices that share the same slice time, the slices are always spatially distant from each other. A 3D acquisition would have all slices with zero, or a regular set of blocks with the same values. I think you need to check the provenance of your images to understand what is going on.