ACR MRI Phantoms: Large / Small

The ACR phantom is approved by the American College of Radiology for the ACR accreditation program. The large MRI phantom is used for comprehensive evaluation of critical imaging parameters of magnetic resonance imaging (MRI) in a time efficient manner. The phantom can be used for the measurement of absolute values for calibration purposes. However, its design is optimized for time efficient daily quality assurance too.

Measures:

• Geometric distortion
• Spatial resolution
• Slice thickness and position
• Interslice Gap
• Image bandwidth
• Low contrast detectability
• Image uniformity
• Signal-to-noise ratio (SNR)
• Physical and electronic slice offset
• Point of reference
• Bandwidth: water-fat shift

Technical data:

• Outside cylinder diameter: 203 mm (8'')
• Outside cylinder height: 165 mm
• Inside cylinder diameter: 190 mm (7,5'')
• Inside cylinder height: 150 mm
• The phantom is filled with 10 millimolar (mmol) nickel chloride solution containing 0.45% by weight sodium chloride
• the outside of each phantom has the words “NOSE” and “CHIN” etched into it as an aid to orienting the phantom for scanning, as if it were a head

Resolution Insert:

• Three matrices of holes, diameters: 0.9, 1.0 and 1.1 mm
• Spaces between the holes are equal to hole diameters
• Two small containers with water and fat for water-fat shift evaluation

‍Slice Thickness Insert:

• 1 mm wide counter-descending slits on both sides
• Slits form two ramps descending at 1:10

‍Geometric Distortion Insert:

• 3 x 3 holes array, 60 mm spacing
• 1.5 mm diameter
• 10 mm thick

Low Contrast Insert:

• Partial volume contribution of these sheets and filling solution produce contrasts: 1.4, 2.5, 3.6, and 5.1%
• Each disc contains 10 groups of 3 holes arranged in spokes
• Each spoke has the same diameter
• Eiameters range from 7.0 to 1.5 mm

Slice position accuracy:

• One set of paired 45° wedges
• Distance between the intersection of the wedges is 100 mm

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Product includes:

• Hard-sided carrying case (MR unsafe) (09-102)
• 0ptional 2-axis spirit level (09-104-1)

The small MRI Phantom is primarily for use with extremity MRI. various fixtures inside, including a grid, cylinders, and other points of interest. Call JRT for specifications.