Reported by (Name):

Geoffrey S. Ibbott, Ph.D
Organization:

International Electrotechnical Commission
Position Title:

Chair, Subcommittee 62C. Member, Working Group 1
Activity:

Working Group meeting
Meeting Dates:

July 10 – 12, 2006
Meeting Location:

Ottawa, Canada
Payment $:

Travel reimbursement
Reasons for Attending or not Attending

Attended to contribute to the writing of international standards for radiotherapy equipment.
Issues from Previous Meetings or Year:

See below.
General Description of Activities of the Organization and/or Meeting:

Working Group 1 IEC Sub-Committee 62C

July 10-12, 2006, Ottawa

Participants

The meeting was attended by Lillicrap (convenor), Sethi (UK); Seidel (secretary), Höppner, Lehmann and Goldstein (Germany); Dvorak, Gerig and Simons (Canada); Ligthart (Netherlands); Johnsen, Marles, Lukey, Coon and Ibbott (US).

Agenda

60601-2-29 Simulator safety standard

Ligthart had distributed the document as a CD and national committee comments were discussed. Almost all were editorial, except one regarding leakage current. As the draft is in agreement with the general standard, the accelerator standard, and the previous edition of this standard, it was agreed to reject the comment. Another comment on gantry rotation speed was accepted. The remaining comments were editorial and will be handled by Guido. Guido will prepare another version for a CDV. Lillicrap does not want Ligthart to spend the time converting this draft to the new template for particular standards.

60601-2-17 Afterloader safety standard

Ibbott agreed to finalize a CD of 60601-2-17 for the next meeting, using the new template.

60976 Accelerator performance standard

Seidel had distributed the compilation of comments shortly after the deadline of July 7. The result of the vote was assumed to be positive, based on reports from attending members. Extensive discussion was held on the comments. The recommendations for changes to clause 8.1.6 were discussed extensively, and it was agreed that the principal drafters would consider the AAPM and European publications and prepare another alternate proposal for discussion prior to the Delft meeting. It is hoped that following the discussion in Delft, an FDIS will be prepared for voting.

60977 Accelerator performance guideline

The comments submitted by national committees were reviewed. Most comments on clause 8.1.6 were deferred until a working party addresses this in 60976. Considerable discussion was held on clause 9.4, on measurements of light field intensity and contrast ratio. Lee Gerig and Geoff Ibbott to review suggestions for periodic measurements, suggest changes (e.g., weekly or daily output checks?) Changes will be reviewed in Delft after which a draft technical report (DTR) will be produced.

60601-2-1, draft 3rd edition.

Sethi described the procedure for revising safety standards for compliance with the 3rd edition of the general standard. He and Brian Bibb had prepared a review of the changes needed for the November ’05 meeting. There appear to be two issues: renumbering clauses to align them with the general standard, and adding new provisions required by the 3rd edition. In addition, there are a number of issues that haven’t been addressed by this standard in the past, or at least it is not clear if the existing clauses address the new 3rd edition requirements for “essential performance”, including:

SRS/SRT

Positioning accuracy

Equipment movements that can cause patient injury

Accessories

Collision avoidance

Dosimetry

Step-and shoot IMRT

Incorrect field shape during delivery

Incorrect MU during delivery

Record and verify system

Neutron doses

Whole body dose

In-vivo dosimetry

Treatment planning system

Role in adaptive therapy

Electronic imaging devices (e.g., EPIDS)

Image orientation

Image scale (magnification) and distortion

Image detail

Field of view and EPID position relative to beam axis

Collision avoidance

Artifacts

Dynamic therapy

Position of moving part with respect to MU

Collision avoidance

Image-guided RT

Movement of patient support

Movement of MLC

Movement of gantry

Movement of treatment unit head

Dosimetry systems

Alternative methods of measuring dose

Programmable wedge systems

Relationship between position and dose

Date of next meeting.

The Working group will meet at the time of the next TC meeting October 2-6 in Delft, Holland.

Respectfully submitted,

Geoffrey S. Ibbott, PhD

Issues for AAPM:

AAPM must stay closely involved in the IEC and its working groups. The decisions made by the IEC dictate the design of radiology and radiotherapy equipment, and affect its use in the clinic, as well as issues of radiation protection. These issues will be discussed during a refresher course at the Orlando meeting.
Budget Request ($):

Liaison to IEC

2006 Budget

Position:

Name:

Reason(s) for requesting funds:

Expenses requested (list and explain):

CY 07

CY 07 (AAPM)

Travel: 9 members to US TAG meeting @ $500 x 2 mtgs

$9,000

3,000

Hotel: 9 members @ $125 x 2 nights x 2 mtgs

$4,500

1,500

Per Diem: 9 members @ $40 x 2 days x 2 mtgs

$1,440

480

Travel: 1 member @$1,000 x 2 international meetings

$2,000

667

Hotel: 1 member @ $125 x 4 nights x 2 mtgs

$1,000

333

Per Diem: 1 member @ $40 x 4 days x 2 mtgs

$320

107

USNC/ANSI dues: 9 members @ $250 ea.

$2250

750

SUBTOTAL

$20,510

6837

Each association’s share (1/3 of total)

$6,837

6837

Date: July 19, 2006

Liaison to IEC

Dr. Geoffrey S. Ibbott

Funds are requested to support travel to meetings of the US Technical Advisory Group (TAG) to IEC subcommittee 62C, Working Group 1, and to meetings of the Working Group itself. The AAPM, ASTRO and ACR share these expenses.

Reported by (Name):

zailu

2006-07-19

Geoffrey Ibbott

aapm