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Patient #

Beam #

Example of a

measurement

logbook

12. Control charts building: Moving-Range

Part 1

:

Introduction to

SPC

Part 2

:

Essential

concepts to

start with SPC

Part 4

Conclusion

Part 3

:

SPC in

practice

A

NALYZE

Individual value

/

Moving Range

Type of drifts to detect

Control charts

Small

and

slow

Ex.: wrong

adjustment of linac’s

parameters, errors

during

measurement…

Ex.: drift of the

detector’s dose

response

Diff. mes/calc. (%)

Patient number

EWMA

- Exponentially

Weighted Moving

Average -

Patient number

Diff. mes/calc. (%)

Large

and

Fast

(I-

MR

)

alue

/

o i

nge

28

03/10/17