PTW QUICKCHECKwebline: Daily quality assurance phantom comparison and overall performance.

Area of Science:

• Medical Physics
• Radiation Oncology
• Quality Assurance

Background:

• The Daily QATM3 phantom is a widely adopted tool for daily quality assurance (QA) in linear accelerator (LINAC) facilities.
• PTW has introduced the QUICKCHECKwebline phantom as a new option for LINAC daily QA.

Purpose of the Study:

• To compare the performance of the PTW QUICKCHECKwebline phantom against the Sun Nuclear Corporation Daily QATM3 phantom.
• To assess the suitability of the QUICKCHECKwebline for daily QA measurements of a linear accelerator.

Main Methods:

• Both phantoms were used for daily QA measurements over a 4-month period on a Varian 23EX LINAC.
• Measurements included photon (6, 18 MV) and electron (6-18 MeV) energies, evaluating dose output, flatness, symmetry, and beam quality.
• Standardized field size (20x20 cm²) and monitor units (150 MU) were employed for all tests.

Main Results:

• Both phantoms demonstrated high consistency, with maximum percent differences from baseline within ±1.41% for all evaluated parameters.
• QUICKCHECKwebline showed maximum differences of -0.97% (output), 1.36% (flatness), 0.86% (in-plane symmetry), -1.41% (cross-plane symmetry), and -0.91% (beam quality).
• Daily QATM3 showed maximum differences of 1.12% (output), 0.82% (flatness), -1.36% (in-plane symmetry), 1.00% (cross-plane symmetry), and 1.29% (beam quality).

Conclusions:

• The QUICKCHECKwebline phantom provides accurate and consistent measurements comparable to the Daily QATM3.
• Its user-friendly interface and wireless capabilities further support its adoption for daily LINAC QA.
• The QUICKCHECKwebline is a suitable alternative for institutions seeking reliable daily quality assurance tools.