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[Home](Home)>[Menu](Menu)>[loadRAW_callback.m](loadRAW_callback)>mapVBVD
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DESCRIPTION:
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Reads Siemens raw .dat file from VB/VD MRI raw data. The raw data can be obtained by calling e.g. twix.image() or for squeezed data twix.image{''} (the '' are needed due to a limitation of matlab's overloading capabilities). Slicing is supported as well, e.g. twix_obj.image(:,:,1,:) will return only the first line of the full data set (all later dimensions are squeezed into one). Thus, slicing of the "memory-mapped" data objects works exactly the same as regular matlab array slicing - with one exception: The keyword 'end' is not supported.
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Overloading of the '()' and '{}' operators works by overloading matlab's built-in 'subsref' function. Matlab calls subsref whenever the operators '()', '{}', or '.' are called. In the latter case, the overloaded subsref just calls the built-in subsref function since we don't want to change the behaviour for '.'-calls. However, this has one minor consequence: There's no way (afaik) to know whether the original call was terminated with a semicolon. Thus, a call to e.g. twix.image.NLin will produce no output with or without semicolon termination. 'a = twix.image.NLin' will however produce the expected result.
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Author: Philipp Ehses (philipp.ehses@tuebingen.mpg.de)
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https://github.com/CIC-methods/FID-A/tree/master/inputOutput/mapVBVD
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Output structure of twix_map_obj with available elements.
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[TUTORIAL](uploads/9742b782c82b4f134f82b6b337f05126/mapVBVD_tutorial.pdf)
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REQUIRES:
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* [twix_map_obj.m](main/General Utilities/twix_map_obj)
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INPUT ARGUMENTS:
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Passed from [load_callback.m](load_callback)
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* filename or simply meas. id, e.g. mapVBVD(122) (if file is in same path) Keep empty (mapVBVD() or mapVBVD(\[\])) to open file open dialog.
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OUTPUT ARGUMENTS:
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Passed to [load_callback.m](load_callback)
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* .image image scan
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* .noise noise scan
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* .phasecor phase correction scan
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* .phasestab phase stabilization scan
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* .phasestabRef0 phasestab. ref. (MDH_REFPHASESTABSCAN && !MDH_PHASESTABSCAN)
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* .phasestabRef1 phasestab. ref. (MDH_REFPHASESTABSCAN && MDH_PHASESTABSCAN)
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* .refscan parallel imaging reference scan
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* .refscanPC phase correction scan for reference data
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* .refscanPS phase stabilization scan for reference data
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* .refscanPSRef0 phasestab. ref scan for reference data
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* .refscanPSRef1 phasestab. ref scan for reference data
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* .RTfeedback realtime feedback data
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* .vop vop rf data (for pTX systems)
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OPTIONAL PARAMETERS/FLAGS:
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* removeOS removes oversampling (factor 2) in read direction
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* doAverage performs average (resulting avg-dim has thus size 1)
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* ignoreSeg ignores segment mdh index (works basically the same as the average flag)
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* rampSampRegrid optional on-the-fly regridding of ramp-sampled readout
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* doRawDataCorrect enables raw data correction if used in the acquisition (only works for VB atm)
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SUBFUNCTIONS:
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* [read_twix_hdr.m](external/read_twix_hdr)
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ORDER OF RAW DATA:
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* Columns
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* Channels/Coils
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* Lines
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* Partitions
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* Slices
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* Averages
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* (Cardiac-) Phases
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* Contrasts/Echoes
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* Measurements
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* Sets
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* Segments
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* Ida
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* Idb
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* Idc
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* Idd
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* Ide |
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\ No newline at end of file |
