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1

2

3

4

5

1

1,00% -1,80% 1,68% -1,07% 3,20%

2

2,02% -1,27% -1,15% -0,55% 3,58%

3

0,20% 2,10% 2,83% -0,52% 5,49%

4

2,11% -2,06 % 0,64%

-

3,68%

5

4,61%

5

0,78%

-0,39%

-

-

MEAN

1,99% -0,45% 0,72% -0,72% 3,99%

Patient #

Beam #

Example of a

measurement

logbook

29

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

)

Individual value

/

o i

nge

7

03/10/17