How to draw a Point's CT value?

[miaoshenmao]

Prerequisites

• [ ] Which version are you using? (Is it latest?) A: the version is cornerstone-tools - 5.1.4

• [ ] Are you reporting to the correct repository? A:not yet

• [ ] Did you search existing issues? (Were any related?) A: I seached "CT" and "hounsfield ",there is no result

Description

Dear 👍 👍 👍 I searched the cornerstoneTools.js ,there are many tools, and i can use every tools in my project,but i can not found the CT value Tools ,could you please tell me how to test a Point's CT value ? is probe means CT value? thank you very much!

the lists tools is just copied from the cornerstoneTools.js : AngleTool, ArrowAnnotateTool, BidirectionalTool, CircleRoiTool, CobbAngleTool, EllipticalRoiTool, FreehandRoiTool, LengthTool, ProbeTool, RectangleRoiTool, TextMarkerTool, BrushTool, SphericalBrushTool, RectangleScissorsTool, FreehandScissorsTool, CircleScissorsTool, CorrectionScissorsTool, CrosshairsTool, DoubleTapFitToWindowTool, DragProbeTool, EraserTool, FreehandRoiSculptorTool, MagnifyTool, OverlayTool, OrientationMarkersTool, PanMultiTouchTool, PanTool, ReferenceLinesTool, RotateTool, RotateTouchTool, ScaleOverlayTool, StackScrollMouseWheelTool, StackScrollMultiTouchTool, StackScrollTool, WwwcRegionTool, WwwcTool, ZoomMouseWheelTool, ZoomTool, ZoomTouchPinchTool, init, stackPrefetch, stackRenderers, playClip, stopClip, store, getModule, getToolForElement, addTool, addToolForElement, removeTool, removeToolForElement, setToolOptions, setToolOptionsForElement, isToolActiveForElement, setToolActive, setToolActiveForElement, setToolEnabled, setToolEnabledForElement, setToolDisabled, setToolDisabledForElement, setToolPassive, setToolPassiveForElement, addToolState, getToolState, removeToolState, clearToolState, setElementToolStateManager, getElementToolStateManager, textStyle, toolStyle, toolColors, toolCoordinates, stackSpecificStateManager, newStackSpecificToolStateManager, addStackStateManager, loadHandlerManager, newImageIdSpecificToolStateManager, globalImageIdSpecificToolStateManager, newFrameOfReferenceSpecificToolStateManager, globalFrameOfReferenceSpecificToolStateManager, forceEnabledElementResize, orientation, SaveAs, enableLogger, disableLogger, register, registerSome, wwwcSynchronizer, updateImageSynchronizer, Synchronizer, stackScrollSynchronizer, stackImagePositionSynchronizer, stackImagePositionOffsetSynchronizer, stackImageIndexSynchronizer, panZoomSynchronizer, requestPoolManager, importInternal, external, EVENTS, version, import,

[plantarflex]

Do you mean hounsfield unit by 'CT value'? Mostly a HU follows this rule

hu = pixel_value * slope + intercept

And cornerstoneTools DragProbeTool directly shows this value when activated. Please check HERE

storedPixels = cornerstone.getStoredPixels(element, x, y, 1, 1);
const sp = storedPixels[0];
const mo = sp * image.slope + image.intercept;
const suv = calculateSUV(image, sp);

// Draw text
str = `SP: ${sp} MO: ${parseFloat(mo.toFixed(3))}`;

[FMCalisto]

You can also use the ProbeTool from CornerstoneTools to get the Hounsfield unit (HU) value of a pixel. The ProbeTool allows you to probe a single pixel and get its HU value as well as its position in image coordinates.

Here is an example of how to use the ProbeTool:

// Get the element to attach the tool to
const element = document.getElementById('myElement');

// Enable the probe tool for the element
cornerstoneTools.addTool(cornerstoneTools.ProbeTool);

// Activate the probe tool for the element
cornerstoneTools.setToolActiveForElement(element, 'Probe', {
  mouseButtonMask: 1 // left mouse button
});

// Add an event listener to get the probe result
element.addEventListener('cornerstoneimagerendered', function(event) {
  // Get the active tool
  const tool = cornerstoneTools.getToolForElement(element, 'Probe');

  // Get the probe result
  const result = tool.probe(event.detail.image, event.detail.canvasContext, event.detail.element);

  // Check if the probe result is valid
  if (result) {
    // Get the HU value and position of the pixel
    const huValue = result.hounsfieldUnits;
    const position = result.imageCoordinates;

    console.log(`Pixel position: (${position.x}, ${position.y})`);
    console.log(`HU value: ${huValue}`);
  }
});

This code attaches the ProbeTool to an element, activates the tool, and adds an event listener to get the probe result. The probe function of the ProbeTool is called whenever the image is rendered and returns the HU value and position of the probed pixel. You can then use these values to draw the CT value in the image.

You can check out my answer on StackOverflow for more information and references on this issue:

https://stackoverflow.com/a/73204850/2371987

[miaoshenmao]

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