C.8.14.5.1 MR Spectroscopy Description Attribute Description

C.8.14.5.1.1 Image Type and Frame Type

The Image Type (0008,0008) and Frame Type (0008,9007) are not included in this Macro but one or the other is always included in the Module or Macro that invokes this Macro, and they are therefore described here.

In addition to the requirements specified in C.8.16.1 Image Type and Frame Type, the following additional requirements and Defined Terms are specified.

C.8.14.5.1.1.1 Pixel Data Characteristics

See C.8.16.1.1. No additional requirements or Defined Terms.

C.8.14.5.1.1.2 Patient Examination Characteristics

See C.8.16.1.2. No additional requirements or Defined Terms.

C.8.14.5.1.1.3 Image Flavor

See C.8.16.1.3 for requirements, but not Defined Terms.

Table C.8-108 specifies the Defined Terms for MR Spectroscopy for Value 3 for Image Type (0008,0008) and Frame Type (0008,9007).

Table C.8-108MR SPECTROSCOPY IMAGE TYPE AND FRAME TYPE VALUE 3

Defined Term Name Defined Term Description
SPECTROSCOPY Spectroscopy

C.8.14.5.1.1.4 Derived Pixel Contrast

See C.8.16.1.4 for requirements, but not Defined Terms.

Table C.8-109 specifies the Defined Terms for Value 4 for Image Type (0008,0008) and Frame Type (0008,9007).

Table C.8-109MR SPECTROSCOPY IMAGE TYPE AND FRAME TYPE VALUE 4

Defined Term Name Defined Term Description
ADDITION Created through point by point addition operation
DIVISION Created through point by point division operation
MAXIMUM Created through point by point maximum operation
MEAN Created through point by point mean operation
MINIMUM Created through point by point minimum operation
MULTIPLICATION Created through point by point multiplication operation
STD_DEVIATION Standard Deviation
SUBTRACTION Created through point by point subtraction operation
NONE Not calculated
MIXED Used only as value in Image Type (0008,0008) if frames within the spectroscopy SOP Instance contain different values for value 4 in their Frame Type (0008,9007) attribute.

C.8.14.5.1.2 Volumetric Properties

See C.8.16.2.1.2. No additional requirements or Defined Terms.

C.8.14.5.1.3 Volume Based Calculation Technique Attribute

See C.8.16.2.1.3 for requirements, but not Defined Terms.

Table C.8-110 specifies the Defined Terms for the Volume Based Calculation Technique (0008,9207) attribute.

Table C.8-110VOLUME BASED CALCULATION TECHNIQUE ATTRIBUTE VALUES

Defined Term Name Defined Term Description
MAX_IP Maximum Intensity Projection
MIN_IP Minimum Intensity Projection
NONE Pixels not derived geometrically
MIXED Used only as a value in Volume Based Calculation Technique (0008,9207) attribute in the MR Spectroscopy Module if frames within the image SOP Instance contain different terms for the Volume Based Calculation Technique attribute in MR Spectroscopy Frame Type Functional Group.

C.8.14.5.1.4 Complex Image Component

The value of the Complex Image Component attribute (0008,9208) shall be used to indicate which component of the complex representation of the signal is represented in the spectroscopy data.

Table C.8-111 specifies the Defined Terms for Complex Image Component attribute (0008,9208).

Table C.8-111COMPLEX IMAGE COMPONENT ATTRIBUTE VALUES

Defined Term Name Defined Term Description
MAGNITUDE The magnitude component of the complex spectroscopy data.
PHASE The phase component of the complex spectroscopy data.
REAL The real component of the complex spectroscopy data.
IMAGINARY The imaginary component of the complex spectroscopy data.
COMPLEX The real and imaginary components of the complex spectroscopy data
MIXED Used only as a value in Complex Image Component (0008,9208) in the MR Spectroscopy Module if frames within the image SOP Instance contain different values for the Complex Image Component attribute in the MR Spectroscopy Frame Type Functional Group.

C.8.14.5.1.5 Acquisition Contrast

Table C.8-112 specifies the Defined Terms for Acquisition Contrast attribute (0008,9209).

Table C.8-112ACQUISITION CONTRAST VALUES

Defined Term Name Defined Term Description
PROTON_DENSITY Proton Density weighted contrast
T1 T1 weighted contrast
T2 T2 weighted contrast
UNKNOWN Value should be UNKNOWN if acquisition contrasts were combined resulting in an unknown contrast. Also this value should be used when the contrast is not known.
MIXED Used only as a value in Acquisition Contrast (0008,9209) attribute in the MR Spectroscopy Module if frames within the SOP Instance contain different values for the Acquisition Contrast attribute in the MR Spectroscopy Frame Type Functional Group.