ATCM performance module

NegotiableUpdate on 02/06

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Overview

CCT228 ATCM phantom, CCT228 ATCM performance phantom is made of sturdy Catthan& #174; Made of uniform materials, it allows measurement of signal noise in three elliptical sections of different sizes to demonstrate the compensation effect of ATCM on trunk size changes and anatomical transitions. This model also helps evaluate the impact of patient alignment changes.

Product Details

CCT228 ATCM phantom, CCT228ATCM performance moduleDetailed introduction:

Automatic tube current modulation (ATCM) is used in conjunction with modern CT scanners to optimize patient dosage while maintaining acceptable image quality. The effectiveness of ATCM varies depending on different imaging schemes and manufacturers.

The CCT228 ATCM Phantom was developed in collaboration with researchers from Karolinska Institute to assist CT operators in characterizing ATCM performance.

CCT228 ATCM phantom, CCT228ATCM performance moduleMade of sturdy Catphan ® Made of uniform materials, it allows measurement of signal noise in three elliptical sections of different sizes to demonstrate the compensation effect of ATCM on trunk size changes and anatomical transitions. This model also helps evaluate the impact of patient alignment changes.

The 65 centimeter long phantom consists of three elliptical parts. Each ellipsoid is 15 centimeters long, with a ratio of 3:2; 25:16.7 cm, 30:20 cm, and 35:23.3 cm sizes. Provide smooth transitions between each section, with rounded corners at both ends. The sides and top of the model are marked with polytetrafluoroethylene with a diameter of 1.6 millimeters to help align the model.

The CCT228 ATCM phantom, CCT228 ATCM performance phantom, and CCT228 ATCM model are designed to use the ATCM algorithm to estimate patient attenuation through projection X-ray (SPR) scanning. Various scanning parameters or models can be applied to reposition and evaluate the impact of parameter changes or patient positioning errors. The generated CT image set can be evaluated based on reference scans to calculate the normalized root mean square error (NRMSE) of the tube current curve and provide a visual assessment of the tube current fluctuation curve and image noise.

In order to better understand the overall effects of different imaging parameters, Catphan ® The model can be used for comprehensive image performance evaluation.

ATCM性能模体

This phantom is made of durable Catphan ® Uniformity material is cast in one piece. By using three elliptical regions of different sizes on the phantom, both image noise and applied tube current can be evaluated, demonstrating how ATCM compensates for the effects of changes in torso size. In addition, this phantom can also be used to evaluate the impact of patient positioning deviation.

This phantom is 65 centimeters long and consists of three elliptical regions. Each ellipsoidal region is 15 centimeters long, with an aspect ratio of 3:2, and sizes of 25:16.7 centimeters, 30:20 centimeters, and 35:23.3 centimeters, respectively. It is suitable for modern CT scanners with spiral collimation widths up to 80 millimeters and using both longitudinal and angular ATCM technology. The transition between each area is smooth, with circular designs at both ends.

The side and top of the phantom are marked with polytetrafluoroethylene (Teflon) markers with a diameter of 1.6 millimeters, which can assist in aligning the phantom with the positioning laser of a CT scanner.

The phantom is designed to first scan through projected radiographic imaging (SPR), and the ATCM algorithm will use this image to estimate the degree of attenuation of the patient. The impact on ATCM can be studied by applying different scanning parameters or repositioning the phantom. The obtained CT image set is used to evaluate the tube current applied along different slice positions of the phantom and the resulting image noise. This method can be used both to provide a basis for optimization work and in conjunction with quality control (QC) to test the stability of scanner ATCM.

To gain a more comprehensive understanding of the overall impact of different imaging parameters, Catphan can be used ® Conduct a comprehensive image performance evaluation of the phantom.

(Note: Teflon is the trade name for polytetrafluoroethylene, commonly used in scenarios that require high temperature resistance and corrosion resistance.); SPR stands for Scan Projection Radiograph, which is a projection image obtained before CT scanning and can be used for localization and pre evaluation; QC stands for Quality Control, which refers to the quality control process of medical equipment. ）

Working principle of ATCM phantom

Simulate the anatomical structure of patientsATCM phantoms are typically made of tissue equivalent materials. Its design presents different sizes and shapes along the length direction (such as stepped or multi elliptical) to simulate changes in patient body thickness and attenuation during the scanning process.
Test the response of the ATCM systemBy scanning the phantom, medical physicists can evaluate the ATCM system of CT scanners and adjust the tube current when simulating changes in the size of the "patient"（ $mAs$ ）The effectiveness. Ideally, the system should increase the tube current for larger cross-sections to maintain image quality, and decrease the tube current for smaller cross-sections to reduce radiation dose.
Evaluate image quality and dosageAnalyze the CT images generated by scanning the phantom to measure key performance indicators along the length direction of the phantom, including:

Image noiseThe consistency of image noise in different cross-sections reflects the effectiveness of ATCM in maintaining constant image quality.
Radiation dose distributionMeasure the tube current and radiation dose at each point and compare them with different dimensions of the phantom.

Evaluate positioning and other variablesThe phantom can also be used to test the impact of patient positioning errors on the performance of the ATCM system, as well as the effects of other variable scan settings.