AutoQA Plus CT Catphan
AutoQA Plus CT Catphan software is designed for simple and intuitive navigation with pass/fail performance evaluation.
Key features include:
- Users can create Report Profiles to control Pass/Fail limits, the output of images, overlays and graphs
- Instant trend analysis using our HTML ‘Trend Report Links’
- Reports available in HTML and PDF formats
- Support local date and number formats
- Multiple language support
- Simple database export to Excel
- Supports compressed and enhanced DICOM images
- Self-service option for offline license activation
AutoQA Plus CT Catphan Image Quality Parameters
- Pixel size (geometric distortion)
- CT Number Linearity (Sensitometry)
- Slice Thickness
- Patient Alignment System and Table Movement Accuracy
- Spatial resolution (MTF)
- Image Uniformity and Noise
- Uniformity Index
- Contrast Detail (Low Contrast Detectability)
- Low Contrast - Contrast-to-noise ratio (CNR) (Catphan 600, 700)
- Slice Sensitivity Profile (SSP)
AutoQA Plus CT Catphan Standard Processing Features
- Pixel Size – test verifies the expected pixel size (information stored in the DICOM header) from the measured set of four calibration pins positioned at a known distance location as specified in the Catphan® section CTP401 and CTP404. Not supported by Catphan 700.
- CT Linearity (Sensitometry) – Mean CT values are calculated for each reference material in the phantom test section. The measured CT numbers are fit to the linear attenuation coefficients using a linear least squares for energies from 40 to 100 keV. The variance representing the lowest variance was designated as the scanner’s effective energy.
- Slice Thickness – is determined from a processing algorithm that calculates the full-width at half-maximum (FWHM) of the CT number profile for each wire ramp. A trigonometric conversion is calculated based on the known ramp angle to yield the slice width. The individual ramp and average ramps calculated slice widths are reported along with the expected slice width. This test also provides information on the position of the phantom and the vertical and horizontal tilt values. A rotation of the phantom about an axis perpendicular to the ramps is also computed
- Localizer and Table Incrementation Accuracy – is assessed from the slice width section when the ramps are paired at opposing angles. The slice width test outputs a parameter called Table Position Offset, which is an offset in the z-axis relative to the center of the opposing wire (or test section). Verification of the scanner table incrementation accuracy can be checked by incrementing the weighted table by 30 mm and then returning the table to the starting position and scanning the slice width module.
- Spatial Resolution (MTF) – The modulation transfer function (MTF) is calculated from the discrete Fourier transform of the average vertical and horizontal LSF’s of the point spread function from the bead or wire test section. The program reports the 50%, 10% and 2% MTF cutoff values.
- Noise and Mean CT Number – is calculated from several regions of interest (ROI) positioned over a water/uniformity phantom section. The number, size and location of these ROI’s are variable, but typically five are defined: one at the phantom center and the other four along the axes at the same radius.
- Uniformity – Vertical and horizontal profiles 10 pixels wide are generated and averaged through the phantom’s center. The fractional uniformity of the profile is calculated as the percentage of the pixels within an acceptable range determined by + 2 times the central noise or + 10H, whichever is smaller. The new IrisQA Report tool will provide the uniformity as the maximum deviation between the 4 peripheral and central ROI measurements.
- Contrast Detail (Low Contrast Resolution) – Theoretical Contrast-Detail data is calculated based on the measured noise of the low contrast modules (CTP263 and CTP515).
- Low Contrast - CNR measurements for low contrast targets in the CTP515 module
- Slice sensitivity profile data processing from an input source (bead) in a series of axial images
- Manual processing mode for the MTF analysis – with variable target (wire/bead) locations and zoom factor
- Printed or saved reports are now available with data grouped (sorted) by test type as an additional option to the standard display format based on image number
Documents
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