IEC 61217:1996/AMD2:2007

IEC 61217
Edition 1.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Radiotherapy equipment – Coordinates, movements and scales

Appareils utilisés en radiothérapie – Coordonnées, mouvements et échelles

IEC 61217 A2:2007
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IEC 61217
Edition 1.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Radiotherapy equipment – Coordinates, movements and scales

Appareils utilisés en radiothérapie – Coordonnées, mouvements et échelles

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
F
CODE PRIX
ICS 11.040.50; 13.280 ISBN 2-8318-9345-3

– 2 – 61217 Amend. 2 © IEC:2007
FOREWORD
This amendment has been prepared by subcommittee 62C: Equipment for radiotherapy,
nuclear medicine and radiation dosimetry, of IEC technical committee 62: Electrical equipment
in medical practice.
The text of this amendment is based on the following documents::
CDV Report on voting
62C/418/CDV 62C/428/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
INTRODUCTION
This Amendment 2 extends the rotation of the patient support devices around the Z-axis in the
IEC fixed coordinate system to two additional rotations – rolling around the patient’s
longitudinal axis and pitching around the patient’s transversal axis.
The use of the two new additional degrees of freedom (pitch and roll) generalizes the
coordinate systems to include systematically 3 rotations and 3 translations, therefore
supporting 6 degrees of freedom in a systematic way. Modern patient support devices with 6
degrees of freedom can use a combined translation and rotation to get the same result as the
eccentric table top rotation. When changing table position data using the new IEC systems,
the definition of isocentric rotations is sufficient to transfer all treatment-related information.
The eccentric table top coordinate system is however maintained for backward compatibility.
NOTE It is quite common in proton therapy to use a treatment chair, where the patient can be rotated and tilted,
while the beam line has a fixed direction.

Page 19
2.1.101 Replace the existing number and text of this subclause (introduced by Amendment 1)
with the following:
2.1.7 For rotational transformations involving more than one rotation the sequence of the
rotations must be kept consistent. If the rotational sequence varies, the resulting
transformation matrix and the orientation of the axis will be different.
The sequence in which the rotations shall be applied is the sequence in which these rotations
are described in Clause 2 of this standard.

61217 Amend. 2 © IEC:2007 – 3 –
–
NOTE M = M (see Clause A.1).
ab ba
Page 27
2.9 Table top coordinate system ("t") (figures 10 and 11)
Replace the existing title and text of this subclause with the following:
2.9 Table top coordinate system ("t") (Figures 10, 11, 18 and 19)
The "t" coordinate system is stationary with respect to the table top and its mother system is
the "e" system. Its origin It is at the specified point located on the median axis of the table top,
which is at the intersection of the median axis of the table top and the vertical axis Zs of the
PATIENT SUPPORT coordinate system when the angle θe of the eccentric vertical rotation (if
available) is zero and when the table top is:
− horizontal;
− laterally centred in the "e" system;
− longitudinally fully withdrawn away from Zs.
The coordinate axis Yt coincides with the longitudinal median axis of the table top and the
coordinate axis Zt is normal to the table top.
In the zero position of the "t" system:
− the origin It is at minimum distance from Ie (table top fully withdrawn);
− Yt and Ye coincide and are in the same direction;
− coordinate axes Xt and Zt are parallel to and in the same direction as the corresponding
axes Xe, Ze.
NOTE 1 When the isocentric and eccentric angular position angles θs and θe are zero (or the eccentric movement
is not available) and the "t" system is in its zero position, the coordinate axes Xt, Yt, Zt coincide with coordinate
axes Xf, Yf and Zf of the fixed system.
Tx, Ty and Tz are the lateral, longitudinal and vertical displacements of the origin It of the
table top system corresponding to movement along the three corresponding coordinate axes
Xe, Ye, Ze, in the eccentric system, or Xs, Ys, Zs in the PATIENT SUPPORT system if eccentric
rotation is not available.
NOTE 2 The purpose of defining the coincidence of the origin It with the ISOCENTRE with the table top fully
withdrawn is to ensure that the longitudinal position of the table top in the “s” or “e” system is expressed by a
positive number for all patient treatments. It is not necessary that this origin be actually marked on the table top at
the isocentre position, since this may not be practical with removable panels, table top extensions, etc. It is only
necessary that the origin It be obtainable from a known distance to an accessible and visible marked point on the
table top.
NOTE 3 Table tops with different possible ranges of longitudinal mechanical motion, e.g. made by different
MANUFACTURERS, could have different positions for the table top origin It.
The rotation of the "t" system about the axis Xt (pitch of the table top) is defined as rotation
angle ψt.
An increase in the value of ψt corresponds to clockwise rotation of the table top as viewed
from the table top coordinate system origin along the positive Xt axis.
The rotation of the "t" system about axis Yt (roll of the table top) is defined as rotation angle
ϕt.
– 4 – 61217 Amend. 2 © IEC:2007
An increase in the value of ϕt corresponds to a clockwise rotation of the table top as viewed
from the table top coordinate system origin along the positive Yt axis.

Page 29
ATIENT coordinate system ("p") (figures 101a and 101b)
2.101 P
Replace the existing number and title of this subclause (introduced by Amendment 1) with the
following:
2.10 PATIENT coordinate system ("p") (Figures 17a and 17b)
Replace, in the second paragraph, the reference to “Figure 101a” by “Figure 17a”.
Page 41
6.7 Table top linear movements
Modify the title of this subclause as follows:
6.7 Table top linear and angular movements
Add the following new subclauses:
6.7.4 Pitch of the table top
Reading increases from 0° to 359° in a clockwise direction when viewed from the table top
coordinate system origin along the positive Xt axis.
Designation: table top pitch
ψt = ______
6.7.5 Roll of the table top
Reading increases from 0° to 359° in a clockwise direction when viewed from the table top
coordinate system origin along the positive Yt axis.
Designation: table top roll
ϕt = ______
Page 45
Replace the existing Table 2 with the following:

61217 Amend. 2 © IEC:2007 – 5 –
Table 2 – Individual coordinate systems
System Mother System origin Device rotation about axis Device linear
designation system by angle displacement
f – Fixed None If None (reference system) None (reference system)
g – GANTRY f Ig ISOCENTRIC GANTRY about Yg by RADIATION SOURCE along Zg
ϕg
ISOCENTRE X-ray IMAGE RECEPTOR Rx
Ry Rz along Xg Yg Zg
b – BEAM LIMITING g Ib BEAM LIMITING DEVICE or Plane at NORMAL TREATMENT
DEVICE or DELINEATOR about Zb by θb DISTANCE along Zb
RADIATION SOURCE
DELINEATOR
RADIATION FIELD or
DELINEATED RADIATION FIELD
edges along Xb and Yb
WEDGE FILTER along Xb and
Yb
w – WEDGE b Iw WEDGE FILTER about Zw by θw
FILTER
Selected point on
WEDGE FILTER
r – X-RAY IMAGE g Ir X-RAY IMAGE RECEPTOR about Zr
RECEPTOR
by θr
Centre of IMAGE
RECEPTION AREA
s – PATIENT f Is
PATIENT SUPPORT about Zs by θs
SUPPORT
On rotation axis
of the turntable
e − Table top s Ie Table top about Ze by θe Table top along Xe Ye Ze
eccentric
On eccentric axis
rotation
of rotation
t – Table top e It PATIENT
Table top about Xt by ψt
Table top about Yt by ϕt
On the median along Xt Yt Zt
axis of the table
top
p – PATIENT t Ip PATIENT about Xp by ψp,
Yp by ϕp and Zp by θp
Selected point in
relation to PATIENT
Page 109
Renumber Figures 101a and 101b as “Figure 17a” and “Figure 17b”.
Add, after Figure 17b, the following new Figures 18 and 19:

– 6 – 61217 Amend. 2 © IEC:2007
Zt
Zt' ψt
Yt'
ψt
Yt
R
Xt-Yt plane
Xt
IEC  2040/07
Figure 18 – Table top pitch rotation
of table top coordinate system Xt, Yt, Zt (see 6.7.4)

Zt'
Zt″
ϕt
Yt'
Yt
R
Xt
ϕt
Xt-Yt plane
Xt″
IEC  2041/07
Figure 18 – Table top roll rotation of
table top coordinate system Xt, Yt, Zt (see 6.7.5)
___________
– 8 – 61217 Amend. 2 © CEI:2007
AVANT-PROPOS
Le présent amendement a été établi par le sous-comité 62C: Appareils de radiothérapie, de
médecine nucléaire et de dosimétrie du rayonnement, du comité d'études 62 de la CEI:
Equipements électriques dans la pratique médicale.
Le texte de cet amendement est issu des documents suivants:
CDV Rapport de vote
62C/418/CDV 62C/428/RVC
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cet amendement.
Le comité a décidé que le contenu de cet amendement et de la publication de base ne sera
pas modifié avant la date de maintenance indiquée sur le site web de la CEI sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. A cette date,
la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
_____________
INTRODUCTION
Cet amendement 2 élargit la rotation des disposit
...