Материал: part03

C.8.4.8.1.4 Number of Phases and Phase Vector​

Number of Phases (0054,0031) is the number of dynamic phases, independent of the number of Detectors and Isotopes. See Sec-​ tion C.8.4.14 for definition of a phase.​

Phase Vector (0054,0030) is an indexing vector. The value of the nth element of this vector is the phase number of the nth frame in​ this image, and shall have a value from 1 to Number of Phases (0054,0031).​

C.8.4.8.1.5 Number of Rotations and Rotation Vector​

Number of Rotations (0054,0051) is the number of separate rotations. See Section C.8.4.12 for definition of a rotation. When Image​ Type (0008,0008), Value 3, is RECON TOMO, GATED TOMO or RECON GATED TOMO, then the Number of Rotations (0054,0051)​ shall be 1.​

Rotation Vector (0054,0050) is an indexing vector. The value of the nth element of this vector is the rotation number of the nth frame​ in this image, and shall have a value from 1 to Number of Rotations (0054,0051).​

C.8.4.8.1.6 Number of R-R Intervals and R-R Interval Vector​

Number of R-R Intervals (0054,0061) is the number of ranges of heartbeat durations collected. A gated acquisition may employ one​ R-R Interval to collect data from normal beats, a second R-R Interval to collect data from ectopic beats, and possibly others. Each​ R-R Interval accepts beats whose duration is greater than its Low R-R Value (0018,1081) and shorter than its High R-R Value​ (0018,1082). Beats that do not fall within these ranges may be accepted by another R-R Interval, or may be rejected.​

The Number of R-R Intervals (0054,0061) is the total number of such ranges.​

R-R Interval Vector (0054,0060) is an indexing vector. The value of the nth element of this vector is the interval number of the nth​ frame in this image, and shall have a value from 1 to Number of R-R Intervals (0054,0061).​

C.8.4.8.1.7 Number of Time Slots and Time Slot Vector​

NumberofTimeSlots(0054,0071)isthenumberofframesintowhicheachgatingeventisdividedinagatedacquisition.Forexample,​ in a cardiac gated acquisition, data from a number of heartbeats are then combined by summing together the first frames from all​ beats into a summed first frame, all the second frames into a summed second frame, and so on. The result has the same number of​ frames as the Number of Time Slots in each beat.​

Time Slot Vector (0054,0070) is an indexing vector. The value of the nth element of this vector is the time slot number of the nth frame​ in this image, and shall have a value from 1 to Number of Time Slots (0054,0071).​

C.8.4.8.1.8 Number of Slices and Slice Vector​

Number of Slices (0054,0081) is the number of slices in each separate volume.​

Note​

For images with Image Type (0008,0008), Value 3, equal to RECON GATED TOMO this implies that Number of Slices​ (0054,0081) is the same for all R-R Intervals and Time Slots.​

Slice Vector (0054,0080) is an indexing vector. The value of the nth element of this vector is the slice number of the nth frame in this​ image, and shall have a value from 1 to Number of Slices (0054,0081).​

C.8.4.8.1.9 Angular View Vector​

Angular View Vector (0054,0090) is an indexing vector. The value of the nth element of this vector is the angular view number of the​ nth frame in this image. If Image Type (0008,0008), Value 3, is TOMO or GATED TOMO, then the value shall be from 1 to Number​ of Frames in Rotation (0054,0053).​

C.8.4.8.1.10 Time Slice Vector​

Time Slice Vector (0054,0100) is an indexing vector. The value of the nth element of this vector is the time slice number of the nth​ frame in this image, and shall have a value from 1 to Number of Frames in Phase (0054,0033).​

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C.8.4.9 NM Image Module​

Table C.8-9 contains the Attributes that describe Nuclear Medicine Images.​

Table C.8-9. NM Image Module Attributes​

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Direction​

Enumerated Values:​

FEET_TO_HEAD​Slicesclosesttothepatient'sfeetwereacquiredfirst.​ HEAD_TO_FEET​Slices closest to the patient's head were acquired​

first.​

Note​

1.​Content Date (0008,0023) and Content Time (0008,0033) are included in the General Image Module, Table C.7-7,​ whenever the images are temporally related. For this purpose, all NM Images are considered temporally related, so that​ these elements are included in an NM Image.​

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2.​Referenced Overlay Sequence (0008,1130) and Referenced Curve Sequence (0008,1145) were previously included​ in this Module as optional Attributes but have been retired. See PS3.3-2004. Referenced Image Real World Value​ MappingSequence(0040,9094)waspreviouslyusedinthisModuletoenclosetheRealWorldValueMappingSequence​ (0040,9096) but has been retired. See PS3.3-2011.​

C.8.4.9.1 NM Image Module Attribute Descriptions​

C.8.4.9.1.1 Image Type​

For NM images, Image Type (0008,0008) Value 3 is specified to be Type 1.​

Enumerated Values for Value 3:​

STATIC​

DYNAMIC​

GATED​

WHOLE BODY​

TOMO​

GATED TOMO​

RECON TOMO​

RECON GATED​

TOMO​

Enumerated Values for Value 4:​

EMISSION​

TRANSMISSION​

Note​

For NM images, Image Type (0008,0008) Value 1 will be ORIGINAL for all raw data and reconstructed images. DERIVED​ may be appropriate for some other results images.​

For NM images, Image Type (0008,0008) Value 2 will be PRIMARY.​

C.8.4.9.1.2 Counts Accumulated​

Counts Accumulated (0018,0070) is the total of all gamma events accumulated in all frames of this Image. This Attribute applies to​ acquisition data, and often does not apply to processed images (DERIVED, SECONDARY).​

C.8.4.9.1.3 Acquisition Termination Condition​

AcquisitionTerminationCondition(0018,0071)isthemethodofacquisitionterminationthatwasactuallyappliedtothedatacollection.​

Defined Terms:​

CNTS​preset count limit was reached​

DENS​preset count density was reached​

MANU​acquisition was terminated manually​

OVFL​acquisition was terminated automatically by pixel data overflow condition​

TIME​preset time limit was reached​

TRIG​preset number of physiological triggers was reached​

C.8.4.9.1.4 Actual Frame Duration​

Actual Frame Duration (0018,1242) is defined as the elapsed time in msec for a single frame of an acquisition. For some types of​ multi-frame images, Actual Frame Duration (0018,1242) may have a more specialized meaning as defined in the appropriate IOD​ Module.​

C.8.4.10 NM Isotope Module​

Table C.8-10 contains Attributes that describe the isotope administered for the acquisition.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 645​

Table C.8-10. NM Isotope Module Attributes​

Note​

The UID is the same Radiopharmaceutical​

Administration Event UID that is in the​

Radiopharmaceutical Radiation Dose Report.​

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