Current automated image analysis routines

 

Every imaging and radiation therapy center has a unique combination of QA devices and protocols. Total QA® allows you the freedom to setup a machine QA system to match those needs.

 

CBCT

The CBCT routine fully automates the analysis of CT image series from the Catphan® 504, 604 (Varian) and Catphan® 503 (Elekta) phantoms. No sorting or slice selection of the images are necessary. Simply scan the phantom according to the LINAC manufacturer’s protocol and drag and drop the entire series into the upload box.

The Total QA CBCT routine measures all CT imaging performance parameters required by TG-142 and presents them in a concise summary for your review.

TG142 Measurements reported include:

  • Geometric Distortion

  • HU Constancy

  • Spatial Resolution

  • Uniformity

  • Contrast

  • Noise


When information beyond a simple summary is required, Total QA provides an in-depth report on your CT system’s imaging characteristics.

Tests include:

  • Sensitometry

  • MTF from Beads and Wires

  • Critical Frequency

  • CT Linearity

  • Contrast Detectability

  • Effective Energy

  • Slice Width

  • Phantom Position, Rotation and Yaw

 

Radiation Light Field

The radiation light field routine automatically analyzes the Standard Imaging FC-2 phantom with the center marker to provide accurate measurements for field size, shape and geometric coincidence of radiation and optical fields. The routine automatically detects the nominal field size and recognizes radiation fields as formed by the MLC or jaws saving you time in sorting images.

Measurements in the Radiation/Light field routine include:

  • Radiation-Light Field Displacement and Magnitude

  • Radiation-Crosshair Displacement and Magnitude

  • Measured Field Size and Area

  • Jaw Position Indicators (Left, Right, Top, Bottom)

  • MLC Position (Left, Right, Top, Bottom)

  • Maximum deviation of measured jaw locations from expected

  • Maximum deviation of measured jaw locations from expected

 

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Planar kV

The planar kV routine analyzes the Standard Imaging QCkV-1 phantom to accurately characterize your kV imagers according to the TG-142 recommendations. Images from the QCkV-1 phantom are automatically recognized and analyzed with no further input required.

Measurements in the planar kV routine include:

  • MTF Curve

  • Spatial Resolution (50%, 40% and 30%)

  • Measured Field Size and Area

  • Contrast and CNR

  • Uniformity

As an alternative Total QA can analyze the Leeds TOR18 phantom to obtain many of the same measurements as the QCkV-1 phantom.

 

Planar MV

The planar MV routine analyzes the Standard Imaging QC3 phantom to accurately characterize your MV imagers according to the TG-142 recommendations. Images from the QC3 phantom are automatically recognized and analyzed with no further input required.

Measurements in the planar MV routine include:

  • MTF Curve

  • Spatial Resolution (50%, 40% and 30%)

  • Measured Field Size and Area

  • Contrast and CNR

  • Uniformity

 

MLC Tests

Automatically characterize leaf position accuracy for your Varian MLC using EPID images. Run standard picket fence plans and then upload the DICOM images. Total QA automatically recognizes the pattern used and measures position and picket FWHM for all leaves at each stopping point in the pattern. The routine then provides a succinct summary and graphics enabling you to identify issues in your leaf positioning.

Measurements in the MLC routine include:

  • Leaf Position Deviation maximum and picket position

  • Leaf Position Standard Deviation

  • Median Leaf Position Deviation

  • FWHM by Leaf and Picket position

  • Median Picket FWHM

 

Radiation and Mechanical Isocenter

Total QA uses a fully automated Winston Lutz test using the Standard Imaging Winston Lutz phantom to accurately characterize your system’s isocentricity to within 0.1mm. Simply upload a folder of Winston Lutz images and let Total QA take care of analyzing and reporting.

Measurements in the Winston Lutz routine include:

  • Coincidence of radiation and mechanical isocenters

  • Ideal Shift and Magnitude of shift

 

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Starshot Analysis

Total QA contains routines for measuring gantry, collimator and table starshot images to quantify the accuracy of rotation for each of these critical subsystems. For gantry starshots simply upload TIFF image scans of the starshot exposure. For collimator and table starshots EPID DICOM images for each beam are composited to create the starshot image.

Measurements in the starshot routine include:

  • Minimum Center Diameter

  • Center Location

 

MLC Leaf Transmission and Dosimetric Leaf Gap

The MLC transmission and dosimetric leaf tests use the standard Varian transmission and leaf gap plan. The static leaf transmissions are calculated from comparisons between open and closed fields in both the A and B leaf banks. For the dosimetric leaf gap calculation a series of increasing leaf gaps is swept across a 10x10 cm field. The EPID readings for each gap are then corrected and regressed to calculate the leaf gap.

Measurements in the transmission and leaf gap module include:

  • A and B Leaf Bank MLC Transmission Percentage

  • Dosimetric leaf gap

 

Asymmetric Field Measurements

The asymmetric field measurement routine measures the accuracy of field delivery using two asymmetric fields using the Standard Imaging FC-2 phantom

Measurements in the asymmetric field measurement routine include:

  • Measured vs nominal field sizes

  • Field edge positions vs nominal