IEC 61217:1996/AMD1:2000
(Amendment)Amendment 1 - Radiotherapy equipment - Coordinates, movements and scales
Amendment 1 - Radiotherapy equipment - Coordinates, movements and scales
Amendement 1 - Appareils utilisés en radiothérapie - Coordonnées, mouvements et échelles
General Information
- Status
- Published
- Publication Date
- 20-Dec-2000
- Drafting Committee
- WG 1 - TC 62/SC 62C/WG 1
- Current Stage
- DELPUB - Deleted Publication
- Start Date
- 07-Dec-2011
- Completion Date
- 26-Oct-2025
Relations
- Effective Date
- 05-Sep-2023
- Effective Date
- 05-Sep-2023
Overview
IEC 61217:1996/AMD1:2000 is an important amendment to the international standard governing radiotherapy equipment. This amendment focuses on the precise definitions and transformations of coordinate systems, movements, and scales used in radiotherapy devices. Prepared by IEC Subcommittee 62C, which specializes in equipment for radiotherapy, nuclear medicine, and radiation dosimetry, this document enhances the base standard with critical details relevant to patient positioning and equipment calibration.
The amendment provides systematic definitions for coordinate system usage, especially the PATIENT coordinate system ("p"), detailing rotations and linear movements essential for accurate radiation dose delivery. Additionally, it introduces an informative annex that describes coordinate transformations between IEC and DICOM patient coordinate conventions-a vital aspect for consistent data integration across medical imaging and radiotherapy treatment planning systems.
Key Topics
PATIENT Coordinate System Definition
- Establishes a fixed coordinate system relative to the patient, with axes Xp, Yp, and Zp aligned parallel to specific anatomical planes (coronal, sagittal, and transverse).
- Defines origin point Ip, which is selected appropriately based on the anatomy and treatment technique; this point may lie outside the patient's body, such as on a fixation device.
- Specifies rotation conventions about each axis:
- Xp-axis rotation (angle ψp) rotates the patient clockwise when viewed from their right side.
- Yp-axis rotation (angle ϕp) rotates the patient clockwise from feet to head view.
- Zp-axis rotation (angle θp) rotates the patient clockwise when viewed from behind.
Sequences of Rotational Transformations
- Emphasizes that when multiple rotations are applied, their sequence must remain consistent to ensure predictable orientation outcomes. Variations in rotation order alter the transformation matrix and axis orientations.
Coordinate System Relationships
- Introduces the "t" (treatment) coordinate system as the mother system for "p," linking patient coordinates to treatment device coordinates.
- Specifies linear displacements Px, Py, and Pz to locate the patient coordinate system origin relative to the treatment coordinate system.
Coordinate Transformation to DICOM Standard
- Provides matrix-based formulas to convert between IEC and DICOM patient coordinate systems.
- Highlights the necessity of a 90° counter-clockwise rotation around the x-axis to translate between coordinate conventions, with explicit rotation matrices detailed.
- Notes potential additional translational transformations if coordinate system origins do not coincide.
Annex F (Informative)
- Dedicated to describing coordinate transformations between IEC and DICOM patient coordinate systems to facilitate interoperability in clinical environments using different imaging and treatment data standards.
Applications
The amendments introduced in IEC 61217:1996/AMD1:2000 are critically important in practical radiotherapy settings where precise patient positioning and equipment calibration directly impact treatment effectiveness and safety. Key applications include:
Radiotherapy Equipment Calibration
Ensures that equipment movements-rotations and linear shifts-are interpreted correctly relative to patient anatomy, improving accuracy in dose delivery.Patient Positioning Systems
Alignment of patients within the radiation treatment room relies on standardized coordinate systems to replicate treatment positions consistently over multiple sessions.Treatment Planning Integration
Facilitates conversion and interoperability between radiotherapy device coordinates and medical imaging data that often use DICOM standards, enabling accurate mapping of dose plans onto patient anatomy.Quality Assurance and Safety
Standardized movement scales and coordinate transformations reduce errors related to misinterpretation of spatial data during radiotherapy procedures.Software Development for Radiotherapy Systems
Provides the mathematical foundation and reference for software engineers developing control systems, imaging software, and treatment planning tools compatible with IEC and DICOM standards.
Related Standards
IEC 61217 (Base Publication)
The foundational standard for radiotherapy equipment coordinates, movements, and scales that this amendment expands and refines.DICOM (Digital Imaging and Communications in Medicine)
A globally used medical imaging and communication standard defining coordinate conventions referenced in coordinate transformations outlined in this amendment.IEC Technical Committee 62 Standards
Related standards on electrical and electronic equipment in medical practice, addressing safety, performance, and interoperability of radiotherapy and diagnostic systems.
Keywords: IEC 61217 amendment, radiotherapy equipment standards, patient coordinate system, coordinate transformation IEC DICOM, radiotherapy device movements, radiation dosimetry standards, medical imaging coordinate systems, radiotherapy patient positioning, IEC Subcommittee 62C.
Frequently Asked Questions
IEC 61217:1996/AMD1:2000 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 1 - Radiotherapy equipment - Coordinates, movements and scales". This standard covers: Amendment 1 - Radiotherapy equipment - Coordinates, movements and scales
Amendment 1 - Radiotherapy equipment - Coordinates, movements and scales
IEC 61217:1996/AMD1:2000 is classified under the following ICS (International Classification for Standards) categories: 11.040.50 - Radiographic equipment; 13.280 - Radiation protection. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61217:1996/AMD1:2000 has the following relationships with other standards: It is inter standard links to IEC 61217:1996, IEC 61217:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
IEC 61217:1996/AMD1:2000 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
STANDARD
AMENDEMENT 1
AMENDMENT 1
2000-12
Amendement 1
Appareils utilisés en radiothérapie –
Coordonnées, mouvements et échelles
Amendment 1
Radiotherapy equipment –
Coordinates, movements and scales
IEC 2000 Droits de reproduction réservés Copyright - all rights reserved
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
G
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
– 2 – 61217 amend. 1 CEI:2000
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:
FDIS Rapport de vote
62C/279/FDIS 62C/287/RVD
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 la publication de base et de ses amendements ne sera
pas modifié avant 2005. A cette date, la publication sera
reconduite;
supprimée;
remplacée par une édition révisée, ou
amendée.
___________
Page 2
SOMMAIRE
Ajouter, à la page 8, le titre de l'annexe F suivant:
Annexe F (informative) Transformations des coordonnées entre les systèmes PATIENT CEI
et DICOM
Page 16
2 Systèmes de coordonnées
Ajouter, à la page 20, après 2.1.6.5, le paragraphe suivant:
2.1.101
Pour les transformations en rotation impliquant plus d'une rotation, il faut que la séquence
des rotations soit toujours la même. Selon les variations de la séquence de rotation, la
matrice de transformation et l'orientation de l'axe qui en résultent seront différentes.
–1
NOTE M = M (voir article A.1).
ab ba
61217 Amend. 1 IEC:2000 – 3 –
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:
FDIS Report on voting
62C/279/FDIS 62C/287/RVD
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 the base publication and its amendments will
remain unchanged until 2005. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
___________
Page 3
CONTENTS
Add, on page 9, the title of annex F as follows:
Annex F (informative) Coordinate transformations between IEC and DICOM PATIENT
coordinates
Page 17
2 Coordinate systems
Add, on page 21, after 2.1.6.5, the following subclause:
2.1.101 For rotational transformations involving more than one rotation the sequence of the
rotations must be kept consistent. If the rotational sequence varies the resulting trans-
formation matrix and the orientation of the axis will be different.
–
NOTE M = M (see clause A.1).
ab ba
– 4 – 61217 amend. 1 CEI:2000
Page 28
Ajouter le paragraphe suivant:
2.101 Système de coordonnées du PATIENT («p») (figures 101a et 101b)
Le système de coordonnées «p» est solidaire du PATIENT, et son système ascendant est le
système «t». Son origine Ip est un point convenablement choisi par rapport à l'anatomie du
PATIENT.
NOTE Chaque PATIENT aura une origine Ip personnalisée, dont la position par rapport à son anatomie sera
choisie de façon appropriée en fonction de la zone de traitement et de la technique de traitement envisagées.
Cependant il n'est pas nécessaire que ce point soit interne au PATIENT ou à sa peau. Par exemple si un dispositif
de contention est utilisé, il peut être logique d'utiliser un point de ce dispositif (ou sa base s'il est fixé au plateau
de la table).
En se référant à la figure 101a, l'axe de coordonnées Xp est parallèle à l'intersection de plans
coronal et transversal du PATIENT. L'axe de coordonnées Yp est parallèle à l'intersection de
plans sagittal et coronal du PATIENT. L'axe de coordonnées Zp est parallèle à l'intersection de
plans sagittal et transversal du PATIENT. L'axe positif Xp est dirigé vers la gauche du PATIENT,
l'axe positif Yp est dirigé dans le sens antério-postérieur du PATIENT et l'axe positif Zp est
dirigé dans le sens posterio-antérieur du PATIENT.
Dans la position angulaire zéro du système «p», les axes de coordonnées Xp, Yp, Zp, sont
parallèles aux axes correspondants Xt, Yt, et Zt du système de coordonnées «t».
ψ
La rotation du système de coordonnées «p» autour de l'axe Xp est défini par l'angle p.
Un accroissement de la valeur de l'angle ψp correspond à une rotation du PATIENT dans le
sens horaire en le regardant depuis sa droite.
La rotation du système de coordonnées «p» autour de l'axe Yp est défini par l'angle ϕp.
Un accroissement de la valeur de l'angle ϕp correspond à une rotation du PATIENT dans le
sens horaire en le regardant dans le sens pieds/tête.
La rotation du système de coordonnées «p» autour de l'axe Zp est défini par l'angle θp.
Un accroissement de la valeur de l'angle θp correspond à une rotation du PATIENT dans le
sens horaire en le regardant de derrière.
Les valeurs de Px, Py et Pz sont les positions latérale, longitudinale et verticale par rapport à
It, de l'origine Ip du système de coordonnées du PATIENT sur les axes correspondants Xt, Yt,
et Zt.
61217 Amend. 1 IEC:2000 – 5 –
Page 29
Add the following subclause:
2.101 PATIENT coordinate system ("p") (see figures 101a and 101b)
The "p" coordinate system is stationary with respect to the PATIENT, and its mother system is
the "t" system. Its origin Ip is at a suitably chosen point defined in relation to the PATIENT’s
anatomy.
NOTE Each PATIENT
...




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