Материал: part03

C.8.4.2 NM Equipment Module (Retired)​

This Section was defined in a previous version of the DICOM Standard. The Section is now retired.​

C.8.4.3 NM Image Module (Retired)​

This Section was defined in a previous version of the DICOM Standard. The Section is now retired.​

C.8.4.4 NM Spect Acquisition Image Module (Retired)​

This Section was defined in a previous version of the DICOM Standard. The Section is now retired.​

C.8.4.5 NM Multi-gated Acquisition Image Module (Retired)​

This Section was defined in a previous version of the DICOM Standard. The Section is now retired.​

C.8.4.6 NM/PET Patient Orientation Module​

Table C.8-5 specifies the Attributes that describe the NM/PET Patient Orientation.​

Table C.8-5. NM/PET Patient Orientation Module Attributes​

C.8.4.6.1 NM/PET Patient Orientation Attribute Descriptions​

C.8.4.6.1.1 Patient Orientation Code Sequence​

The Patient Orientation Code Sequence (0054,0410) is used to describe the orientation of the patient with respect to gravity, and is​ independent of the position in the gantry.​

- Standard -​

C.8.4.6.1.2 Patient Orientation Modifier Code Sequence​

The Patient Orientation Modifier Code Sequence (0054,0412) is used to modify or enhance the orientation specified by Patient Ori-​ entation Code Sequence (0054,0410).​

C.8.4.6.1.3 Patient Gantry Relationship Code Sequence​

Patient Gantry Relationship Code Sequence (0054,0414) is used to describe the patient direction within the gantry, such as head-​ first or feet-first. When imaging the extremities, these directions are related to normal anatomic position.​

Example: In normal anatomic position, the fingers point towards the feet.​

C.8.4.7 NM Image Pixel Module​

Table C.8-6 specifies the Attributes that describe the pixel data of a NM image.​

Table C.8-6. NM Image Pixel Module Attributes​

column spacing, in mm. See Section 10.7.1.3 for further explanation of​ the value order.​

C.8.4.7.1 NM Image Pixel Attribute Descriptions​

C.8.4.7.1.1 Photometric Interpretation​

Enumerated Values:​

MONOCHROME2​

PALETTE COLOR​

See Section C.7.6.3.1.2 for definition of these terms.​

C.8.4.8 NM Multi-frame Module​

Table C.8-7 specifies the Attributes of a NM Multi-frame Image. This Module is always included in a NM SOP instance, even if there​ is only one frame in the image.​

A NM Image object is always a multi-dimensional multi-frame image. The order and organization of the frames within each image is​ defined by the Frame Increment Pointer (0028,0009). The Frame Increment Pointer (0028,0009) references one or more indexing​

- Standard -​

vectors.Anindexingvectorisa1dimensionalarraywithexactlyoneelementforeachframeintheimage.Thevalueofthenthelement​ in the indexing vector represents the index for the nth frame, in that dimension. Indices are always numbered starting from 1.​

Note​

The scheme for encoding a multi-dimensional array of frames into a single image object is as follows. First, the definition of​ the Data Element called the Frame Increment Pointer is changed so that it can be multi-valued (i.e., its VM is now 1-n). Each​ value of Frame Increment Pointer represents one of the dimensions of the array, with the last value representing the most​ rapidly changing index. Each value of Frame Increment Pointer is the Tag of a Data Element that is an indexing vector. An​ indexing vector is a 1 dimensional array with exactly one element for each frame in the image. The value of the nth element​ in the indexing vector represents the index for the nth frame, in that dimension. For example, suppose you are encoding a​ Dynamic image consisting of 2 phases (containing 5 and 2 frames, respectively), from each of two detectors, using one​ isotope,whichgivesatotalof14framesintheimage.ForaDynamicimage,theFrameIncrementPointerisdefinedas:Frame​ Increment Pointer = Energy Window Vector (0054,0010) \ Detector Vector (0054,0020) \ Phase Vector (0054,0030) \ Time​ Slice Vector (0054,0100). Pixel Data (7FE0,0010) would contain the frames in the following order:​

and the four vectors would be defined as:​

Energy Window Vector = 1,1,1,1,1,1,1,1,1,1,1,1,1,1​

Detector Vector = 1,1,1,1,1,1,1,2,2,2,2,2,2,2​

Phase Vector = 1,1,1,1,1,2,2,1,1,1,1,1,2,2​

Time Slice Vector = 1,2,3,4,5,1,2,1,2,3,4,5,1,2​

The receiver can tell the relationship of all the frames from these four vectors. For instance, looking at the 11th value in these​ four vectors tells you that the 11th frame in this multi-frame object is time slice 4 of phase 1 from detector 2 and isotope 1.​

TheEnergyWindow,Detector,Phase,Rotation,R-RInterval,andTimeSlotVectorshavecorrespondingSequenceAttributes​ that contain exactly one Sequence Item for each of the index values in the vector. The Sequence Item contains a set of At-​ tributes that are specific to that group of frames, but change from one group to the next. In the above example there would​ be a detector Sequence Attribute, an isotope Sequence Attribute and a phase Sequence Attribute (for dynamics, no frame​ Sequence Attribute is needed). The detector and phase Sequence Attributes would contain two Sequence Items (because​ there were 2 detectors and 2 phases).​

Table C.8-7. NM Multi-frame Module Attributes​

- Standard -​

Note​

Per the rules in PS3.5, if an Attribute of Type 1C or 2C is not required, it shall not be included.​

C.8.4.8.1 NM Multi-frame Attribute Descriptions​

C.8.4.8.1.1 Frame Increment Pointer​

By definition, NM Images are multi-dimensional Multi-frame Images. The value of Frame Increment Pointer (0028,0009) contains the​ Tag for one or more frame indexing vectors. This determines the number of dimensions of frame indices in the image, and the order​ in which these indices vary from one frame to the next, with the last Tag indicating the most rapidly changing index. The Enumerated​ Values for Frame Increment Pointer (0028,0009) are determined by Image Type (0008,0008) Value 3, as shown in Table C.8-8.​

- Standard -​

Page 640​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-8. Enumerated Values for Frame Increment Pointer​

C.8.4.8.1.2 Number of Energy Windows and Energy Window Vector​

Number of Energy Windows (0054,0011) is the number of distinct energy window groupings acquired in this image. See Sec-​ tion C.8.4.10.1. When Image Type (0008,0008), Value 3, is RECON TOMO or RECON GATED TOMO, then the Number of Energy​ Windows (0054,0011) shall be 1.​

Energy Window Vector (0054,0010) is an indexing vector. The value of the nth element of this vector is the energy window number​ for the nth frame in this image, and shall have a value from 1 to Number of Energy Windows (0054,0011).​

C.8.4.8.1.3 Number of Detectors and Detector Vector​

Number of Detectors (0054,0021) is the number of separate detectors that differentiate the frames in this image. When Image Type​ (0008,0008), Value 3, is RECON TOMO or RECON GATED TOMO, then the Number of Detectors (0054,0021) shall be 1.​

Note​

NumberofDetectors(0054,0021)doesnotnecessarilyrepresenttheactualnumberofdetectorsusedduringdataacquisition.​

Example 1: In a TOMO acquisition in which frames from 2 or more detectors are interleaved to form one continuous set of frames,​ then no distinction is made between frames on the basis of which detector created them. In this case, the Number of Detectors​ (0054,0021) would be 1.​

Example 2: In a WHOLE BODY acquisition in which a single detector acquires anterior and posterior views in two separate passes,​ the Number of Detectors (0054,0021) would be 2.​

Detector Vector (0054,0020) is an indexing vector. The value of the nth element of this vector is the detector number of the nth frame​ in this image, and shall have a value from 1 to Number of Detectors (0054,0021).​

- Standard -​