C.8.14.1 MR Spectroscopy Module

Table C.8-102 specifies the attributes of the MR Spectroscopy Module.

Table C.8-102 MR SPECTROSCOPY MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Include ' MR Image and Spectroscopy Instance Macro' Table C.8-81
Image Type (0008,0008) 1 Spectroscopy data characteristics. See C.8.14.5.1.1.
Include 'MR Spectroscopy Description Macro' Table C.8-107
Transmitter Frequency (0018,9098) 1C Precession frequency in MHz of the nucleus being addressed for each spectral axis. See section C.8.14.1.1 for further explanation of the ordering. Required if Image Type (0008,0008) Value 1 is ORIGINAL. May be present otherwise.
Spectral Width (0018,9052) 1C Spectral width in Hz. See section C.8.14.1.1 for further explanation of the ordering. Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Chemical Shift Reference (0018,9053) 1C The chemical shift at the transmitter frequency in ppm. See section C.8.14.1.1 for further explanation of the ordering. Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Volume Localization Technique (0018,9054) 1C Name of volume localization technique used. Shall be “NONE” if no spatial localization was performed. Defined Terms: ILOPS ISIS PRIME PRESS SLIM SLOOP STEAM NONE Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Volume Localization Sequence (0018,9126) 1C A sequence of Items that provide the position of RF excitations used to select a volume of tissue. The selected volume is described by the intersection of the sequence Items. One or more Items shall be included in this sequence. Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Volume Localization Technique (0018,9054) is other than NONE. May be present if Volume Localization Technique (0018,9054) is other than NONE.
>Slab Thickness (0018,9104) 1 Thickness of slab in mm.
>Slab Orientation (0018,9105) 1 The direction cosines of a normal vector perpendicular to the selection plane with respect to the patient. See C.7.6.2.1.1 for further explanation.
>Mid Slab Position (0018,9106) 1 The x, y, and z coordinates of the mid-point of the slab in mm. See C.7.6.2.1.1 for further explanation.
De-coupling (0018,9059) 1C Indicates whether de-coupling was active. Enumerated Values: YES NO Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
De-coupled Nucleus (0018,9060) 1C Nucleus being de-coupled. Defined Terms: 1H 3HE 7LI 13C 19F 23NA 31P 129XE See section C.8.14.1.1 for further explanation of the ordering. Required if De-coupling (0018,9059) equals YES.
De-coupling Frequency (0018,9061) 1C The center frequency (Hz) for the de-coupling. See section C.8.14.1.1 for further explanation of the ordering. Required if De-coupling (0018,9059) equals YES.
De-coupling Method (0018,9062) 1C The de-coupling modulation scheme used. Defined Terms: MLEV WALTZ NARROWBAND Required if De-coupling (0018,9059) equals YES.
De-coupling Chemical Shift Reference (0018,9063) 1C The chemical shift in ppm at the de-coupling frequency. See section C.8.14.1.1 for further explanation of the ordering. Required if De-coupling (0018,9059) equals YES.
Time Domain Filtering (0018,9065) 1C Describes time domain filtering or apodization applied. Shall be NONE if no filtering operations were applied to the time domain data. Defined Terms: COSINE COSINE_SQUARED EXPONENTIAL GAUSSIAN HAMMING HANNING LORENTZIAN LRNTZ_GSS_TRNSFM NONE See section C.8.14.1.1 for further explanation of the ordering. Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Number of Zero Fills (0018,9066) 1C Number of zero fills added to the time domain data before FT. Shall be 0 (zero) if no zero filling performed. See section C.8.14.1.1 for further explanation of the ordering. Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Baseline Correction (0018,9067) 1C Describes baseline correction techniques. Shall be NONE if no baseline correction was performed. Defined Terms: LINEAR_TILT LOCAL_LINEAR_FIT POLYNOMIAL_FIT SINC_DECONVOLUTN TIME_DOMAIN_FIT SPLINE NONE Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Frequency Correction (0018,9101) 1C Specifies whether operations were performed to correct resonant frequency of metabolite peaks due to B0 field inhomogeneities. Enumerated Values: YES NO Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
First Order Phase Correction (0018,9198) 1C Describes whether a first order (frequency dependent) phase correction was applied to the spectral data. Enumerated Values: YES NO Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.
Water Referenced Phase Correction (0018,9199) 1C Enumerated Values: YES NO Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

C.8.14.1.1 MR Spectroscopy Attribute Multiplicity Ordering

The following attributes may have a Value Multiplicity of one or two depending whether one or two frequency axes are used as specified by the value of Data Point Rows (0028,9001):

Transmitter Frequency (0018,9098)

Resonant Nucleus (0018,9100)

Spectral Width (0018,9052)

Chemical Shift Reference (0018,9053)

De-coupled Nucleus (0018,9060)

De-coupling Frequency (0018,9061)

De-coupling Chemical Shift Reference (0018,9063)

Time Domain Filtering (0018,9065)

Number of Zero Fills (0018,9066)

Value 1 shall contain the value corresponding to the sampling time axis (the axis along a data point row).

Value 2, if present, shall contain the value corresponding to the evolution time axis (the axis along a data point column).