IEC 61217:2011

IEC 61217 ®
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiotherapy equipment – Coordinates, movements and scales

Appareils utilisés en radiothérapie – Coordonnées, mouvements et échelles
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IEC 61217 ®
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiotherapy equipment – Coordinates, movements and scales

Appareils utilisés en radiothérapie – Coordonnées, mouvements et échelles

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XB
ICS 11.040.50; 13.280 ISBN 978-2-88912-824-2

– 2 – 61217 © IEC:2011
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope and object . 10
2 Normative references . 10
3 Coordinate systems . 10
3.1 General . 10
3.2 General rules . 11
3.3 Fixed reference system ("f") (Figure 1a) . 12
3.4 GANTRY coordinate system ("g") (Figure 4) . 12
3.5 BEAM LIMITING DEVICE or DELINEATOR coordinate system ("b") (Figure 5) . 13
3.6 WEDGE FILTER coordinate system ("w") (Figure 7) . 13
3.7 X-RAY IMAGE RECEPTOR coordinate system ("r") (Figures 6 and 8) . 14
3.8 PATIENT SUPPORT coordinate system ("s") (Figure 9) . 14
3.9 Table top eccentric rotation coordinate system ("e") (Figures 10 and 11) . 15
3.10 Table top coordinate system ("t") (Figures 10, 11, 18 and 19). 15
3.11 PATIENT coordinate system ("p") (Figures 17a and 17b) . 16
3.12 Imager coordinate system ("i") and focus coordinate system ("o") . 17
3.12.1 General . 17
3.12.2 The imager coordinate system ("i") . 17
3.12.3 Focus coordinate system ("o") . 18
4 Identification of scales and digital DISPLAYS . 18
5 Designation of ME EQUIPMENT movements . 19
6 ME EQUIPMENT zero positions. 19
7 List of scales, graduations, directions and DISPLAYS . 20
7.1 General . 20
7.2 Rotation of the GANTRY (Figures 14a and 14b) . 20
7.3 Rotation of the BEAM LIMITING DEVICE or DELINEATOR (Figures 15a and 15b) . 20
7.4 Rotation of the WEDGE FILTER (Figures 7 and 14a) . 20
7.5 RADIATION FIELD or DELINEATED RADIATION FIELD . 21
7.5.1 General . 21
7.5.2 Edges of RADIATION FIELD or DELINEATED RADIATION FIELD (Figure 16a) . 21
7.5.3 DISPLAY of RADIATION FIELD or DELINEATED RADIATION FIELD
(Figures 16a to 16k) . 22
7.6 PATIENT SUPPORT isocentric rotation . 23
7.7 Table top eccentric rotation . 23
7.8 Table top linear and angular movements . 24
7.8.1 Vertical displacement of the table top . 24
7.8.2 Longitudinal displacement of the table top . 24
7.8.3 Lateral displacement of the table top . 24
7.8.4 Pitch of the table top . 24
7.8.5 Roll of the table top . 24
7.9 X-RAY IMAGE RECEPTOR movements . 24
7.9.1 X-RAY IMAGE RECEPTOR rotation . 24
7.9.2 X-RAY IMAGE RECEPTOR radial displacement from RADIATION SOURCE
(SID) . 25
7.9.3 X-RAY IMAGE RECEPTOR radial displacement from ISOCENTRE . 25

61217 © IEC:2011 – 3 –
7.9.4 X-RAY IMAGE RECEPTOR longitudinal displacement . 25
7.9.5 X-RAY IMAGE RECEPTOR lateral displacement . 25
7.10 Other scales . 25
Annex A (informative) Examples of coordinate transformations between individual
coordinate systems . 57
Annex B (informative) Coordinate transformations between IEC and DICOM PATIENT
coordinates . 64
Bibliography . 65
Index of defined terms . 66

Figure 1a – Coordinate systems for an isocentric RADIOTHERAPY EQUIPMENT (see 3.1)
with all angular positions set to zero . 27
Figure 1b – Translation of origin Id along Xm, Ym, Zm and rotation around axis Zd
parallel to Zm (see 3.2d)) . 28
Figure 1c – Translation of origin Id along Xm, Ym, Zm and rotation around axis Yd
parallel to Ym (see 3.2d)) . 28
Figure 2 – X Y Z right-hand coordinate mother system (isometric drawing) showing ψ,
ϕ, θ directions of positive rotation for daughter system (see 3.2a)) . 29
Figure 3 – Hierarchical structure among coordinate systems (see 3.2c) and 3.2e)) . 30
Figure 4 – Rotation (ϕg = 15°) of GANTRY coordinate system Xg, Yg, Zg in fixed
coordinate system Xf, Yf, Zf (see 3.4) . 31
Figure 5 – Rotation (θb = 15°) of BEAM LIMITING DEVICE or DELINEATOR coordinate
system Xb, Yb, Zb in GANTRY coordinate system Xg, Yg, Zg, and resultant rotation of
RADIATION FIELD or DELINEATED RADIATION FIELD of dimensions FX and FY (see 3.5) . 32
Figure 6 – Displacement of image intensifier type X-RAY IMAGE RECEPTOR coordinate
system origin, Ir, in GANTRY coordinate system, by Rx = –8, Ry = +10, Rz = –40
(see 3.7) . 33
Figure 7 – Rotation (θw = 270°) and translation of WEDGE FILTER coordinate system Xw,
Yw, Zw in BEAM LIMITING DEVICE coordinate system Xb, Yb, Zb, the BEAM LIMITING DEVICE
coordinate system having a rotation θb = 345° (see 3.6) . 34
Figure 8 – Rotation (θr = 90°) and displacement of X-RAYIMAGE RECEPTOR coordinate
system Xr, Yr, Zr in GANTRY coordinate system Xg, Yg, Zg (see 3.7) . 35
Figure 9 – Rotation (θs = 345°) of PATIENT SUPPORT coordinate system Xs, Ys, Zs in
fixed coordinate system Xf, Yf, Zf (see 3.8) . 36
Figure 10 – Table top eccentric coordinate system rotation θe in PATIENT SUPPORT
coordinate system which has been rotated by θs in the fixed coordinate system with
θe = 360° – θs (see 3.9 and 3.10) . 37
Figure 11a – Table top displaced below ISOCENTRE by Tz = –20 cm (see 3.9 and 3.10) . 37
Figure 11b – Table top coordinate system displacement Tx = + 5, Ty = Le + 10 in
PATIENT SUPPORT coordinate system Xs, Ys, Zs rotation (θs = 330°) in fixed coordinate
system Xf, Yf, Zf (see 3.9 and 3.10) . 38
Figure 11c – Table top coordinate system rotation (θe = 30°) about table top eccentric
system. PATIENT SUPPORT rotation (θs = 330°) in fixed coordinate system Tx = 0, Ty =
Le (see 3.9 and 3.10) .
...