VCT Vision ELITE Series Spezifikationen PDF herunterladen (Seite 147)

GE H

EALTHCARE

IRECTION

DOC0500644, R

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IGHT

PEED

* DICOM C

ONFORMANCE

TATEMENT

147 of 157

Note:

Exposue.ppt

T. Toth 03-Aug-04

prescribed image coverage

exposure time = total x-ray on time

helical total coverage= (exposure time * table velocity)

axial or cine total coverage = macro row thickness * no of active rows

Slice thickness = nominal prospective reconstructed slice selection

image thickness

views to make image

exposure = (exposure time) * (image avg mA)* (slice thickness)/(total coverage)

Total coverage

(avg mA for image)

Decsciption of how to calculate the Dicom Exposure field (0018,1152)

A.4.5 Frame of Reference Module

Attribute Name Tag Type Notes

Frame of Reference UID (0020,0052) 1 See Caution below.

Position Reference Indicator (0020,1040) 2

Value as entered at the user

interface.

A.4.6 Other Attributes

Attribute Name Tag Type Notes

Temporal Position Index (0020,9128) 3

Filled into CT image for some

applications. Pass number for

shuttle images.

Nominal Percentage of

Cardiac Phase

(0020,9241) 3

Filled into CT image for some

applications. Prescribed

percentage of cardiac phase.

It is possible for the operator of CT LightSpeed and BrightSpeed

system to change the table height while scanning a series of

images. Therefore, implementations must use the Frame of

Reference UID (0020,0052) in conjunction with the Table Height

(0018,1130) to determine if two images are spatially related.

CAUTION

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