Start: Nov 01, 2019
End: May 30, 2020

An AAPM Grand Challenge

The MATCH challenge stands for Markerless Lung Target Tracking Challenge. The aim is to systematically investigate and benchmark the accuracy of various approaches for lung tumour motion tracking during radiation therapy in both a retrospective simulation study (Part A) and a prospective phantom experiment (Part B).

What is the Rationale?

The goal of the MATCH challenge is to explore the possibility of tracking lung tumour motion without the cost and risk of surgically inserted fiducial markers at the time that is needed most – in real-time during the radiation treatment.

Lung cancer stereotactic ablative body radiation therapy (SABR) is one of the cancer treatment success stories. The American Association of Physicists in Medicine (AAPM) Task Groups 76 1 (respiratory motion management) and 1012 (stereotactic body radiation therapy) have highlighted the need for accurate target tracking during radiation therapy. To further improve patient safety for SABR, reduce margins and account for the breath-to-breath and day-to-day variation in lung tumour motion several commercial and academic markerless lung target tracking algorithms have been developed. These algorithms have yet to be benchmarked using a common prospective measurement methodology. This knowledge gap motivated the Markerless Lung Target Tracking Challenge.

The Challenge

The MATCH challenge consists of two parts: (Part A) in-silico study based on images with unknown motion and (Part B) experimental phantom measurements with patient-measured motion. The challenge is open to any participant, and participants can complete either one or both parts of the challenge.



  • November 2019 – Registration for participation opens.
  • November 2019 – Start of MATCH Part B.
  • December 2019 – Participants receive challenge datasets for MATCH Part A.
  • 30 May 2020 – The deadline for submitting the results for MATCH Part A and Part B.
  • July 2020 – The results of the challenge study were presented at the Joint AAPM/COMP Meeting.
  • August 2020 – The challenge datasets will be made publicly available for future research studies.


  1. Keall PJ, Mageras GS, Balter JM, et al. The management of respiratory motion in radiation oncology report of AAPM Task Group 76 [published online ahead of print 2006/11/09]. Med Phys. 2006;33(10):3874-3900.
  2. Benedict SH, Yenice KM, Followill D, et al. Stereotactic body radiation therapy: The report of AAPM Task Group 101. Med Phys. 2010;37(8):4078-4101.