Материал: part03

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CNTS​counts​

DENS​density (counts/sec)​

RDD​ relative density difference (change in counts/sec)​

MANU​manual​

OVFL​data overflow​

TIME​time​

TRIG​physiological trigger​

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FEET_TO_HEAD​Slices closest to the patient's feet were acquired first.​

HEAD_TO_FEET​Slices closest to the patient's head were acquired first.​

Note​

The formulas for the determination of SUVbw, SUVbsa, SUVlbm (James) and SUVibw are defined in Sugawara et al. Ree-​ valuation of the Standardized Uptake Value for FDG: Variations with Body Weight and Methods for Correction. Radiology,​ 1999 at http://radiology.rsna.org/content/213/2/521.​

Unfortunately, Sugawara used a parameter of 120 rather than 128 for males, propagating an error in Morgan DJ, Bray KM.​ LeanBodyMassasaPredictorofDrugDosage:ImplicationsforDrugTherapy.ClinicalPharmacokinetics.1994;26(4):292–307,​ which misquoted the original LBM definition that used 128 in James WPT, Waterlow JC. Research on Obesity: A Report of​ the DHSS/MRC Group. London: Her Majesty’s Stationery Office; 1976. Implementations differ in whether they have used​ 120 or 128 when the DICOM Defined Term is LBM. See Kelly M. SUV: Advancing Comparability and Accuracy. Siemens;​ 2009. Available from: http://www.mpcphysics.com/documents/SUV_Whitepaper_Final_11.17.09_59807428_2.pdf.​

The Janmahasatian LBM formula is defined in Janmahasatian et al. Quantification of Lean Bodyweight. Clin Pharmacokinet.​ 2005Oct1;44(10):1051–65.athttp://dx.doi.org/10.2165/00003088-200544100-00004anditsroleinSUVlbm(Janma)calcu-​ lation is discussed in Tahari et al. Optimum Lean Body Formulation for Correction of Standardized Uptake Value in PET​ Imaging. Journal of Nuclear Medicine. 2014 Sep 1;55(9):1481–4. at http://jnm.snmjournals.org/content/55/9/1481. See also​ CID 85 “SUV Units” in PS3.16.​

C.8.9.1.1 PET Series Attribute Descriptions​

Note​

The meaning of a General Series in DICOM is determined by the Attributes in the General Series Module and by the Source​ Entities (Patient, Study, Frame of Reference, Equipment) that originate the Series. The Source Entities are the single-valued​ entities of the 1->n relationship, where the Series is the multi-valued entity. Therefore, a Series is a group of images that:​ are from the same patient and Study; are from the same Equipment; and, are from the same spatial Frame of Reference.​

The PET Image IOD further refines a PET Series IE by the Attributes in the PET Series Module, the PET Isotope Module, the PET​ Multi-gated Acquisition Module and the Acquisition Context Module. These are the Attributes that shall not change from Image to​ Image. Therefore, in addition to the criteria above for a General Series (same patient, Study, Frame of Reference, equipment), the​ Attributes in the PET Series IE define a PET Series as a group of images that: are from the same temporal Frame of Reference; have​

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the same fundamental meaning (e.g., same units: either activity density, metabolism, or attenuation); are derived from the same​ activity source (emission or transmission); are from the same isotope and radiopharmaceutical; were derived from the same recon-​ struction processing; and, originated from the same acquisition setup and parameters, including the patient conditions (cardiac stress​ or rest) if applicable.​

C.8.9.1.1.1 Specialization of Image Plane Module and Image Pixel Module Attributes​

For PET Series, the following Image Pixel Module Attributes shall not vary from Image to Image:​

•​Photometric Interpretation (0028,0004)​

•​Rows (0028,0010)​

•​Columns (0028,0011)​

•​Bits Allocated (0028,0100)​

•​Bits Stored (0028,0101)​

•​Pixel Representation (0028,0103)​

For PET Series, the following Image Plane Module Attributes shall not vary from Image to Image:​

•​Pixel Spacing (0028,0030)​

For PET Series where Series Type (0054,1000), Value 2 is IMAGE, the following Image Plane Module Attributes shall not vary from​ Image to Image:​

•​Image Orientation (Patient) (0020,0037)​

Note​

This means that for a Series Type (0054,1000) Value 2 of IMAGE, all images in the PET Series lie on parallel planes. The​ images, however, may have non-uniform spacing along the normals to the planes.​

For PET Series where Series Type (0054,1000), Value 2 is REPROJECTION, Image Orientation (0020,0037) shall vary such that​ the images rotate about a single axis. Geometrically, the normal to each image plane is defined by the cross product of its row and​ column vectors. Each reprojection image has one Center Normal that passes through the center of the image. Reprojection images​ within a PET Series shall have their Center Normals be co-planar and pass through a single point.​

C.8.9.1.1.2 Series Date, Series Time​

For PET Series, Series Date (0008,0021) and Series Time (0008,0031) are specified to be Type 1. Series Date (0008,0021) and​ Series Time (0008,0031) are used as the reference time for all PET Image Attributes that are temporally related, including activity​ measurements. Series Date (0008,0021) and Series Time (0008,0031) are not tied to any real-world event (e.g., acquisition start,​ radiopharmaceutical administration) and their real-world meaning are implementation dependent.​

C.8.9.1.1.3 Units​

The units of the pixel values obtained after conversion from the stored pixel values (SV) (Pixel Data (7FE0,0010)) to pixel value units​ (U), as defined by Rescale Intercept (0028,1052) and Rescale Slope (0028,1053).​

Defined Terms:​

CNTS​ counts ({counts}, UCUM, "Counts")​

NONE​ unitless (1, UCUM, "no units")​

CM2​ centimeter**2 (cm2, UCUM, "Centimeter**2")​

CM2ML​ centimeter**2/milliliter (cm2/ml, UCUM, "Centimeter**2/milliliter")​

PCNT​ percent (%, UCUM, "Percent")​

CPS​ counts/second ({counts}/s, UCUM, "Counts per second")​

BQML​ Becquerels/milliliter (Bq/ml, UCUM, "Becquerels/milliliter")​

MGMINML​ milligram/minute/milliliter (mg/min/ml, UCUM, "Milligrams/minute/milliliter")​

UMOLMINML​micromole/minute/milliliter (umol/min/ml, UCUM, "Micromole/minute/milliliter")​

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