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Table of contents

Factors affecting patient dose

IR(ME)R 2000

Overview

Effect of scan parameters on dose

Effect of scan parameters on CTDIvol

Effect of scan parameters on CTDIvol (2)

Effect of scan parameters on CTDIvol

Effect of scan parameters on CTDIvol (3)

Effect of scan parameters on CTDIvol (4)

Effect of scan parameters on CTDIvol (5)

Effect of scan parameters on CTDIvol (6)

Effect of scan parameters on CTDIvol (7)

Spiral scanning considerations

Spiral v Axial dose

Spiral v Axial dose: Overscan

Effect of pitch on CTDIvol

Effective mAs

Effect of varying pitch and mA

Multi-slice considerations

Dosimetry in multi-slice CT

Extra x-ray beam width in z-axis

Extra x-ray beam width in z-axis (2)

Extra x-ray beam width in z-axis:

Multi-slice: Effect of over-beaming on CTDI

Multi-slice: Effect of over-beaming on CTDI (2)

Z-axis geometric efficiency

Multi-slice dose issues : helical scanning

Multi-slice: scan protocols

Effect of patient size

Effect of patient size (2)

Displayed CTDIvol in paediatric CT

Adjusting mAs for patient size

Adjusting mAs for patient size (2)

Adjusting mAs for patient size (3)

An Inspector Calls

Diagnostic Reference Levels

Diagnostic Reference Levels in CT

Dose info on scanner console

How to calculate reference doses

National reference doses - 2003 review

National reference doses - 2003 review (2)

Author: Maria Lewis

E-mail: maria@impactscan.org

Homepage: http://www.impactscan.org/

ImPACT course presentation index: http://www.impactscan.org/impactcourseslides.htm