Scans Acquired At The Same Tomographic Plane; Geometric Dose Efficiency - GE Revolution CT User Manual

4.3 Scans Acquired at the Same Tomographic Plane

IEC standard 60601-2-44:2009, clause 203.107 states that you must be warned when scans are
acquired at the same tomographic plane, i.e. same scan location. The need for the warning is to
make users aware of the potential dose that can be given to the patient when acquiring scans at
the same table location.
When acquiring scans in this mode:
•
Utilize the dose information displayed on the
displayed is covered in the next section, CTDI
• An optional DICOM Structured Report (SR) Dose Report is saved in Series 997.
•
Use proper techniques for the application and anatomy you are scanning.
A warning message is posted when [Confirm Settings] is selected for the following scan types:
SmartPrep, Cine or Axial scans with zero table increment (scan interval)
After reading the message, if you wish to continue with the scan, click [Continue], otherwise
click [Cancel].

4.4 Geometric Dose Efficiency

A warning message is posted when the Geometric Dose Efficiency in the Z-direction is less than
70%. Geometric Dose Efficiency is a measure of how much of the X-ray beam in the Z-direction
is used by the system.
NOTE: Images 1-12, 13-28 is an example of a location where Geometric Efficiency in Z is
less than 70%.
Chapter 3 Safety
WARNING
USE OF CONTROLS OR ADJUSTMENTS, OR PERFORMANCE OF
PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN, MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
WARNING
THIS SERIES CONTAINS ONE OR MORE GROUPS WITH MULTIPLE SCANS
AT THE SAME TOMOGRAPHIC PLANE, I.E. SAME LOCATION.
DO YOU WANT TO CONTINUE?
WARNING
PROLONGED EXPOSURE TO X-RAY IN ONE SPOT MAY CAUSE
REDDENING OR RADIATION BURNS. USERS MUST BE AWARE OF THE
TECHNIQUES USED AND EXPOSURE TIME TO ENSURE SAFE OPERATION.
WARNING
THE FOLLOWING GROUPS IN THE SERIES CONTAINS GEOMETRIC
EFFICIENCY IN THE Z DIRECTION OF LESS THAN 70%: IMAGES 1-12,13-28.
Direction 5480385-1EN, Revision 1
Scan Settings screen. The dose information
.
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