datatype fieldname

NIFTI-1 usage    

ANALYZE 7.5 field(s)

was header_key substruct

int  sizeof_hdr

MUST be 348

int sizeof_hdr

char  data_type[10]

Unused

char data_type[10]

char  db_name[18]

Unused

char db_name[18]

int   extents

Unused

int extents

short session_error

Unused

short session_error

char  regular

Unused

char regular

char  dim_info

MRI slice ordering

char hkey_un0

was image_dimension substruct

short dim[0]

Data array dimensions; dim[0] = number of dimensions; if dim[0] is outside range 1..7, then the header information needs to be byte swapped appropriately

short dim[8]

short dim[1]

NIFTI-1 reserves dimensions 1,2,3 for space x,y,z

short dim[2]

short dim[3]

short dim[4]

NIFTI-1 reserves dimensions 4 for time (t)

short dim[5]

storing multiple values at each spatiotemporal voxel

short dim[6]

short dim[7]

float intent_p1

1st intent parameter

short unused8, short unused9

float intent_p2

2nd intent parameter

short unused10, short unused11

float intent_p3

3rd intent parameter

short unused12, short unused13

short intent_code

NIFTI_INTENT_* code

short unused14

short datatype

Defines data type

short datatype

short bitpix

Number bits/voxel

short bitpix

short slice_start

First slice index

short dim_un0

float pixdim[0]

Grid spacings; Method 2 uses a factor 'qfac' which is either -1 or 1; qfac is stored in the otherwise unused pixdim[0].  If pixdim[0]=0.0 (which should not occur), we take qfac=1

float pixdim[8]

float pixdim[1]

x scale

float pixdim[2]

y scale

float pixdim[3]

z scale

float pixdim[4]

float pixdim[5]

float pixdim[6]

float pixdim[7]

float vox_offset

Offset into .nii file (should be at least 352)

float vox_offset

float scl_slope

Data scaling: slope

float funused1

float scl_inter

Data scaling: offset

float funused2

short slice_end

Last slice index

float funused3

char  slice_code

Slice timing order

float funused3

char  xyzt_units

dx, dy, dz & dt units: NIFTI_UNITS_* code

float funused3

float cal_max

Max display intensity

float cal_max

float cal_min

Min display intensity

float cal_min

float slice_duration

Time for 1 slice

float compressed

float toffset

Time axis shift  

float verified

int   glmax

Unused

int glmax

int   glmin

Unused

int glmin

was data_history substruct

char  descrip[80]

char descrip[80]

char  aux_file[24]

auxiliary filename

char aux_file[24]

short qform_code

NIFTI_XFORM_* code

all ANALYZE 7.5  fields below here are replaced  

short sform_code

sform_code > 0 indicates affine transformation

float quatern_b

Quaternion b param

float quatern_c

Quaternion c param

float quatern_d

Quaternion d param  

float qoffset_x

Quaternion x shift   

float qoffset_y

Quaternion y shift   

float qoffset_z

Quaternion z shift

float srow_x[4]

1st row affine transform

float srow_y[4]

2nd row affine transform

float srow_z[4]

3rd row affine transform

char intent_name[16]

'name' or meaning of data

char magic[4]

Indicates nifti-type; must be "ni1\0" or "n+1\0"

byte extension[4]

extension = (esize/16) + (2²² *code)