Artis Systems VD12: Quantification with Artis QCA/QVA Video
This video explains how to analyze vessels using Quantitative Coronary Analysis (QCA) and Quantitative Vascular Analaysis (QVA) in the Quant task card on the control room unser interface.
- 0:50 Calibration
- 4:12 QCA/QVA Workflow
- 7:19 Performing Evaluations
- 8:58 Title Results
the quantification with Artis Cvideo. In this video you will learn how to analyze vessels using quantitative coronary analysis, QC A and quantitative vascular analysis, Cuba in the quant test card on the control room, user interface. You will find several tools for coronary analysis, vascular analysis and left ventricular analysis in the analyze sub task card in the quant test card on the control room user interface, your quant task card may be located on your Artis workplace or on your syngo X workplace. Prior to starting analysis with the tools in Quant, make sure that you have a suitable image loaded and displayed in full screen. In the Quant tab card. Additionally, you must calibrate the image to access the calibration tools, select the calibrate sub task card. Automatic ISO Center auto ISO calibration can be used when the organ to be examined was in the isocenter during acquisition. This calibration method is automatically pre selected by the system for images with angles between 50 degrees and 130 degrees. If it is not automatically selected, click on the icon to start auto ISO calibration. Confirm with OK. If the organ to be examined is a known distance from the tabletop, you can use auto table object distance toad calibration. The system automatically selects teody calibration for image angles zero degrees to 50 degrees and image angles 130 degrees to 180 degrees. If it is not automatically selected, click on the icon to start auto towed calibration. If the system angle is between 15 to 50 degrees or 130 to 165 degrees, you must click on the point in the image that you want to perform a measurement. Enter the to devalue in the field or use the up and down arrows to select the teody confirm with OK. If there is an object on the image of a known distance, you can use manual distance calibration for this method to be accurate. The calibration object should be on the same plane as the object to be measured. Additionally, the calibration object should be larger than the object to be measured. If there is a catheter in the same plane as the object of interest, you can use catheter calibration to calibrate the image. For catheter calibration, you marked the center line in the catheter. This part of the catheter should be straight. First, mark the starting position of the center line with a single click. Move the mouse pointer to the end point of the center line, then click on the endpoint. The system automatically detects the edges of the contour of the catheter. Enter the size of the catheter used for calibration in French units. If you have an image of a sphere that was acquired under the same conditions as the image that you want to analyze, you can use sphere calibration. The image of the sphere must have the same zoom stage source to flat detector distance and object to flat detector distance as the image that you want to analyze. If you haven't already known calibration factor, for example, a previous calibration factor, you can enter this value rather than calibrate the image again. Click on the manual calibration icon. Enter the value in millimeters per pixel, select OK. Using quantitative coronary analysis QC A and quantitative vascular analysis, Cuba, you can determine various physiological properties of arteries such as vessel diameter. Q See A is used for stenosis evaluation in the coronary arteries. Vessels 0.5 millimeters to 7 millimeters in diameter, qv A is used for a stenoses evaluation in larger vessels. 0.5 millimeters to 50 millimeters in diameter. Although QCA in Cuba analyze different vessels, the workflow for the analysis is the same. First, select the required analysis tool, QC A or Cuba. For curved vessels you use a number of single clicks within the vessel to define the vessel centerline. Define the proximal starting point in the center of the vessel with a single click. If required, define any intermediate points in the center of the vessel with single clicks. A maximum of 20 points can be marked, including the start and the end point. Define the distal end point with a double left click or a right click. Take care when defining the vessel path. Ensure that you select artifact free images and avoid vessels with catheter and guide wires. Additionally, avoid vessel segments with many crossover vessels or vessel branches. To mark a vessel with bifurcation, define the proximal starting point with a single click. Define intermediate points of the main branch with single left clicks. To find the distal end point of the main branch with a single right click. Mark the bifurcation point and the centerline of the side branches outside of the main vessel with a single left click. Define the distal end point of the side branch with a double left click. After you have defined the centerline of the vessel, the software automatically detects the contour of the vascular margins. If you are not satisfied with the result, you can manually correct the vessel contour. If the currently marked Contour does not include a bifurcation, you can choose one of the following options. With soft correction, the corner points of the drawn contour are slightly smoothed. With hard correction, the corner points of the contour remain unchanged. If the defined contour is too large, you can trim the contour start outside the contour with a single click. Define the intermediate points inside the vessel with a single click. Define the endpoint outside the contour with a double click. The restriction is applied to the contour. You can use various analysis methods depending on the detected vessel contour. You can calculate the stenosis based on the automatically determined reference diameter. Click on the icon. The system defines a reference diameter and calculates the stenosis. The results are displayed in the diameter diagram. If required, you can change the position of the MLD minimum lumen diameter line in the diameter diagram. Press on the MLD line in the diameter diagram. Keep the mouse pressed and move the line. If necessary, you can change the position of the limits in the diameter diagram. Move the mouse to the appropriate dashed line in the diameter diagram. Keep the left mouse button pressed and move the line. You fix the position when you release the mouse button. If you click the diameter diagram, the local diameter value is displayed above the diameter curve. The position is shown as a dot in the vessel. You can also perform an analysis based on a manually defined reference diameter. Click on manual reference. Place the reference line manually at any position in the analyzed vessel segment. Synopsis calculation is started. During analysis, results are displayed in the preliminary results window. If required, you can store a report and print it or send it with the images that you analyzed. The level of detail in the report can be configured via quant configuration.
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