2.3.3.2.24. NXtomophase¶
Status:
application definition, extends NXobject
Description:
This is the application definition for x-ray or neutron tomography raw data with ...
This is the application definition for x-ray or neutron tomography raw data with phase contrast variation at each point.
In tomography first some dark field images are measured, some bright field images and, of course the sample. In order to properly sort the order of the images taken, a sequence number is stored with each image.
Symbols:
These symbols will be used below to coordinate datasets with the same shape.
nBrightFrames: Number of bright frames
nDarkFrames: Number of dark frames
nSampleFrames: Number of image (sample) frames
nPhase: Number of phase settings
xSize: Number of pixels in X direction
ySize: Number of pixels in Y direction
- Groups cited:
NXdata, NXdetector, NXentry, NXinstrument, NXmonitor, NXsample, NXsource
Structure:
entry: (required) NXentry
start_time: (required) NX_DATE_TIME ⤆
end_time: (required) NX_DATE_TIME ⤆
definition: (required) NX_CHAR ⤆
Official NeXus NXDL schema to which this file conforms ...
Official NeXus NXDL schema to which this file conforms
Obligatory value:
NXtomophase
instrument: (required) NXinstrument ⤆
bright_field: (required) NXdetector ⤆
dark_field: (required) NXdetector ⤆
sample: (required) NXdetector ⤆
data: (required) NX_INT (Rank: 4, Dimensions: [nSampleFrames, nPhase, xSize, ySize])
sequence_number: (required) NX_INT (Rank: 2, Dimensions: [nSampleFrames, nPhase]) ⤆
x_pixel_size: (required) NX_FLOAT {units=NX_LENGTH} ⤆
y_pixel_size: (required) NX_FLOAT {units=NX_LENGTH} ⤆
distance: (required) NX_FLOAT {units=NX_LENGTH} ⤆
Distance between detector and sample
Descriptive name of sample
rotation_angle: (required) NX_FLOAT (Rank: 1, Dimensions: [nSampleFrames]) {units=NX_ANGLE} ⤆
x_translation: (required) NX_FLOAT (Rank: 1, Dimensions: [nSampleFrames]) {units=NX_LENGTH} ⤆
y_translation: (required) NX_FLOAT (Rank: 1, Dimensions: [nSampleFrames]) {units=NX_LENGTH}
z_translation: (required) NX_FLOAT (Rank: 1, Dimensions: [nSampleFrames]) {units=NX_LENGTH}
control: (required) NXmonitor ⤆
integral: (required) NX_FLOAT (Rank: 1, Dimensions: [nDarkFrames + nBrightFrames + nSampleFrame]) {units=NX_ANY}
Total integral monitor counts for each measured frame. Allows a correction ...
Total integral monitor counts for each measured frame. Allows a correction for fluctuations in the beam between frames.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.