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Task Group No. 474: MPPG 24 Part A: Performance Tests for Proton Pencil Beam Scanning Delivery Systems (TG474)

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To provide a list of critical performance tests to assist the Qualified Medical Physicist (QMP) in establishing and maintaining a safe and effective quality assurance (QA) program for pencil beam scanning (PBS) proton therapy machines. The MPPG charges are analogous to those of MPPG 8.b for linear accelerators but address performance tests and considerations unique to PBS proton therapy machines, including but not limited to:
? Minimum required resources and equipment
? Developing a quality management program for performance tests
? Equipment and detector selection
? Recommended tests and frequency
? Dose per monitor unit (MU)
? Proton energy (range)
? Spot size/shape
? Spot divergence
? Spot delivery constancy
? Mechanical tests
? Image-guidance
? Range shifters and beam modifiers
? Respiratory gating equipment
? Safety
? QMP guidance on tolerance and action levels
By-Laws:Not Referenced.Rules: Not Referenced.
Standing?This is not a standing committee.
Approved Date(s):5/4/2026
Reviewable Draft Deadline:
Committee Keywords: No Keywords Entered

Board of Directors
Professional Council
Clinical Practice  [Status]
SC on Practice Guidelines  [Status]
MPPG 24: Physics Aspects of Proton Radiotherapy  [Status]
TG474: MPPG 24 Part A: Performance Tests for Proton Pencil Beam Scanning Delivery Systems  [Status]

» Conflict of Interest report for TG474
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Chair

William Hrinivich
Task Group Chair

2026 Roster

(dates shown below are start and end dates of position.)

= complete and up-to-date
= up-to-date but expires soon
= incomplete or out of date conflict of interest statement.

VOTING AppointmentsThere are 9 voting members.

up-to-dateRichard A. Amos, MS

5/3/2026 - 12/31/2028 Member
up-to-dateSerdar Charyyev

5/3/2026 - 12/31/2028 Member

up-to-dateChin-Cheng Chen, PhD

5/3/2026 - 12/31/2028 Member
up-to-dateXuanfeng Ding, PhD

5/3/2026 - 12/31/2028 Member

up-to-dateYao Hao, PhD

5/3/2026 - 12/31/2028 Member
up-to-dateWilliam T. Hrinivich, PhD

5/3/2026 - 12/31/2028 Task Group Chair

up-to-dateHeng Li, PhD

5/3/2026 - 12/31/2028 Member
up-to-dateMichael J. MacFarlane, PhD, BS

5/3/2026 - 12/31/2028 Member

up-to-dateMark Pankuch, PhD

5/3/2026 - 12/31/2028 Task Group Vice Chair
NON-VOTING AppointmentsThere are 0 non-voting members and guests.
HQ Team Appointed to CommitteeThere are 0 staff.



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