CT Image Quality Phantom

17 July 2023

Products , Quality control

1,104

The CT image quality phantom is designed and built with eight main cylinders to measure CT number accuracy, slice thickness accuracy, geometric accuracy, spatial resolution, point spread function (PSF), edge spread function (ESF), modulation transfer function (MTF), contrast resolution and uniformity.

In this phantom, spatial resolution can be measured in terms of the number of cycles per unit length, the number of pairs of lines per unit length, and the PSF, ESF, and MTF. In addition, in the designed phantom, the spatial resolution can be measured up to 21 pairs of lines per centimeter. Also in this phantom, the contrast resolution consisted of six sets of cylinders with different contrasts and sizes.

The CT image quality phantom is capable of evaluating a wide range of parameters affecting CT image quality. In addition to performing quality control tests, this phantom can be used to optimize noise and dose reduction techniques

Product Features

1- CT Number Accuracy Measurement Module

2- Section Thickness Measurement Accuracy Module

3- Spatial Resolution Measurement Module (Cycles per Unit Length)

Point spread function measurement module, edge spread function, modulation transfer function

Spatial resolution measurement module (up to 21 line pairs/mm)

Contrast resolution measurement module

Geometric dimension accuracy measurement module

Image uniformity measurement module

Storage compartment

Handle

Horizontal level along the y-axis

Horizontal level along the x-axis

Feet

Storage compartment door

:Specifications of different CT scan quality control phantom modules

CT number accuracy measurement module:
Dimensions and structure	A cylindrical piece with a diameter of 198 mm, with eight cylinders with diameters of 25 mm, made of tissue-equivalent material.
Checkable parameters	Accuracy and repeatability of CT or Hounsfield numbers of tissue equivalent materials
Measurement range	numbers include: 5/4 + ، 106+ ، 72- ، 26- ، 89+ ، 123+ ، 951+ و 997-
material	Acrylic and equivalent textured materials

Section thickness accuracy measurement module:
Dimensions and structure	A cylindrical piece with a diameter of 198 mm consisting of four stainless steel wires at an angle of 23 degrees.
Checkable parameter	The correct size of the thickness of the section
Measurement range	From one tenth to 15 mm
material	Acrylic body and stainless steel wire included

Spatial resolution measurement module (in terms of number of cycles per unit length):
Dimensions and structure	A cylindrical piece with a diameter of 198 mm containing three sets of eight rows of holes of different diameters.
Checkable parameter	Spatial resolution in terms of number of cycles per unit length
Measurement range	diameter of the holes include 75/1 ، 5/1 ، 25/1 ، 1 ، 75/0 ، 61/0 ، 50/0 و 40/0 eqaul to mm 86/2، 33/3، 4، 5، 67/6، 20/8، 10، 5/12 Line pairs per centimeter
material	acrilyc

Point Spread Function (PSF), Edge Spread Function (LSF), Modulation Transfer Function (MTF) Measurement Module:
Dimensions and structure	A cylindrical piece with a diameter of 198 mm has a Teflon half-cylinder and an empty cylinder and a stainless steel wire with a diameter of 0.25 mm in the middle.
Checkable parameter	PSF، LSF, MTF
Measurement range	From zero to one hundred percent for MTF
material	acrylic

Spatial resolution measurement module (in terms of number of line pairs per unit length):
Dimensions and structure	A cylindrical piece with a diameter of 198 mm containing 21 sets of grooves of different widths
Checkable parameter	Spatial resolution in terms of number of line pairs per unit length
Measurement range	From 1 to 21 number of line pairs per centimeter
material	acrylic

Contrast resolution measurement module:
Dimensions and structure	A cylindrical piece of acrylic with a diameter of 198 mm, consisting of six sets of cylinders with different contrasts and sizes, including three sets of cylinders around the perimeter with diameters of 15 ،9 ، 8، 7، 6، 5، 4، 3، 2، 1 و 5/. Three sets in the center with diameters 9، 7، 5 , 3
Checkable parameter
Measurement range	Contrast resolution
material	Acrylic and fillers

Geometric accuracy measurement module:
Dimensions and structure	Cylindrical piece with diameter 198 8holes with 4 circles in 6 diameter In hypothetical positions of the clock 12، 3، 6 , 9 4circles in 4 mm diameter in hypothetical position of the clock 5/1,5/4, 5/7 , 5/10
Checkable parameters	Geometric accuracy
measurment range	100mm between consecutive large or small holes
material	acrylic

Image uniformity measurement module:
dimansion and structure	Cylindrical container with a diameter of 198 mm 34 mm wide with two valves for filling or emptying distilled water
Checkable parameters	Image uniformity and artifacts
Measurement range	CT numbers
material	Acrylic cylindrical container containing a uniform substance (distilled water or air)