Quality Management 2017

Value driven tolerance limits – RP162

R ADIOTHERAPY

Physical Parameter

Suspension Level

Reference

Type

(IEC (2007, 2008c) clause numbers

unless stated)

Symmetry of electron fields (max/min ratio) Maximum ratio of absorbed dose (max/min ratio)

>1.05

A

1.09 See IEC

A

Dose monitoring system

7

Weekly calibration check

>2 %

A

>0.5 %

A

Reproducibility

Proportionality

>2 %

A

Dependence on angular position of gantry and beam limiting device

>3 %

A

Dependence on gantry rotation

>2 % - electron radiation >3 % - X-radiation

A

Stability throughout the day

>2 %

A

Stability in moving beam radiotherapy

See IEC

A

8

Depth dose characteristics

X-radiation

Criteria for Acceptability of Medical Radiological Equipment used in Diagnostic Radiology, Nuclear Medicine

Penetrative quality

>3 % or 3 mm.

A

and Radiotherapy. RP 162 (European Commission), 2013

>2 %

IPEM (1999) B

Depth dose and profiles