Image Quality Indices

Image Quality Indices (IQIs) are values that quantify the quality of an image. Image quality is not a single factor, but it is a composite of many aspects, like contrast, blur, noise and distortion just to name a few. Test objects are designed to highlight some aspects of image quality through their details. Each test object is composed by a set of details, and for each detail AutoPIA calculates some IQIs according to this list. Please follow the link for a complete description.

Mammography

• TOR MAS and TOR MAX
  • 5.6mm low contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Visibility
  • 0.5mm and 0.25mm high contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Detail Compacted Contrast (DCC)
    • Visibility
  • High contrast resolution grid
    • Modulation Transfer Function (MTF)
  • Uniform step wedge
    • Relative Contrast
  • Microparticle step wedge
    • Variance Ratio
• TOR MAM
  • 3.0mm low contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Visibility
  • Microparticles
    • Variance Ratio
  • Filaments
    • Contrast-to-Noise Ratio
• DMAM2 Gold and DMAM2 Threshold Contrast
  • 2.0mm, 1.0mm, 0.5mm, 0.25mm, 0.16mm and 0.10mm high contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Detail Compacted Contrast (DCC)
    • Visibility
• DMAM2 MTF
  • Edge
    • Modulation Transfer Function (MTF)
• DMAM2 Foil
  • Aluminium foil
    • Contrast-to-Noise Ratio (CNR)
• DMAM2 Uniformity
  • Whole area
    • Image receptor homogeneity (EUREF 4th ed. 2b.2.2.3.1)
    • Uncorrected defective detector elements (EUREF 4th ed. 2b.2.2.3.3)
    • Image receptor homogeneity with variance (EUREF 4th ed. supplement 2b.2.2.3.1)
• PIX MAM 300x240 and PIX MAM 250D
  • Aluminium foil
    • Contrast-to-Noise Ratio (CNR)
• PMMA
  • Whole area
    • Image receptor homogeneity (EUREF 4th ed. 2b.2.2.3.1)
    • Uncorrected defective detector elements (EUREF 4th ed. 2b.2.2.3.3)
    • Image receptor homogeneity with variance (EUREF 4th ed. supplement 2b.2.2.3.1)

Radiography (CR and DR)

• TOR CDR
  • 8.0mm low contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Visibility
  • 0.5mm high contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Detail Compacted Contrast (DCC)
    • Visibility
  • High contrast resolution grid
    • Modulation Transfer Function (MTF)
  • Uniform step wedge
    • Relative Contrast
• PIX 13
  • 1.5mm low contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Visibility
  • High contrast resolution grid
    • Modulation Transfer Function (MTF)
  • Uniform step wedge
    • Relative Contrast
  • Uniform area
    • Uniformity
  • X-Ray versus Light Field allignment
    • Dimensions difference
    • Centres difference

Fluoroscopy

• TOR 18FG
  • 8.0mm low contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Visibility
  • High contrast resolution grid
    • Modulation Transfer Function (MTF)

Threshold Contrast

• TO 20, TO 16, TO 12 and TO 10
  • 11.0mm, 8.0mm, 5.6mm, 4.0mm, 2.8mm and 2.0mm low contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Visibility
  • 1.4mm, 1.0mm, 0.7mm, 0.5mm, 0.35 mm and 0.25 high contrast circular details
    • Contrast-to-Noise Ratio (CNR)
    • Detail Compacted Contrast (DCC)
    • Visibility

Dental

• CBCT 161
  • Whole phantom
    • Linearity (R2)
    • Homogeneity
    • Modulation Transfer Function (MTF)
  • External PMMA, Air, PVC and Internal PMMA
    • Noise and Mean Pixel Value