WO2012083503A1 - 基于切伦科夫效应的断层成像方法和系统 - Google Patents
基于切伦科夫效应的断层成像方法和系统 Download PDFInfo
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- WO2012083503A1 WO2012083503A1 PCT/CN2010/002141 CN2010002141W WO2012083503A1 WO 2012083503 A1 WO2012083503 A1 WO 2012083503A1 CN 2010002141 W CN2010002141 W CN 2010002141W WO 2012083503 A1 WO2012083503 A1 WO 2012083503A1
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- imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/22—Measuring radiation intensity with Cerenkov detectors
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T12/00—Tomographic reconstruction from projections
Definitions
- the present invention relates to an imaging system, and more particularly to a tomographic imaging system and method and system based on the Cherenkov effect. Background technique
- the CLI quantitatively characterizes the nuclide plane profile and does not describe the depth information of the source in the body. In order to obtain depth information on the distribution of the core nucleus of the organism, Spindli et al.
- Multi-spectral techniques are used to estimate the depth information of the source, but its essence is still single-view plane imaging; Li et al. (Opt. Lett. 2010, 35: 1109-1111 proposed Cherenkov fluorescence tomography (Cerenkov Luminescence Tomography, CLT) concept, and the realization of three-dimensional tomographic imaging of the nuclide distribution under the assumption of uniform medium model.
- CLT Cherenkov Luminescence Tomography
- DA diffusion approximation
- the continuous Cherenkov spectrum is not only mainly located in the 300-700 nm band, but the energy distribution is inversely proportional to the square of the wavelength.
- a method of tomographic imaging based on the Cherenkov effect comprises the steps of:
- the planar optical image and the three-dimensional structure image acquired by the multi-angle are spatially registered to establish a mapping table of the geometric position relationship of the optical-microcomputer tomography; the planar optical image is based on the established geometric position mapping table.
- the gray level intensity of each pixel point is converted into the light intensity and then mapped to the three-dimensional object body surface to form a body surface light signal intensity distribution map B;
- the image of the acquired tomographic image is subjected to image segmentation processing, and each organ of the imaging object is segmented and given different pixel values;
- the segmented volume data is discretized using a finite element method, and the volume grid is output;
- step K If the target function value F K ⁇ V after the image update is iterated in step K , the iterative calculation is stopped, where V is the target threshold constant.
- a tomography system based on the Cherenkov effect comprising: Cherenkov fluorescence detection device for acquiring planar optical images;
- a structural imaging device for acquiring a three-dimensional structure image
- a physical object imaging bed device for supporting an imaged object
- the invention adopts a high-order simplified spherical harmonic approximation model and an iterative semi-threshold operator phase coupling method for global CLT reconstruction, and rapidly realizes three-dimensional tomographic imaging of radiopharmaceutical or molecular probe distribution in vivo. Since the present invention uses the conventional CCD detector to realize molecular nuclear medicine imaging, the imaging device and the imaging device such as PET/SPECT and y cameras greatly reduce the cost of equipment construction and maintenance, lower the threshold of nuclear medicine imaging research, and expand the optical molecular imaging probe. The space available for selection extends the range of optical molecular imaging research and applications. DRAWINGS
- Figure 1 is a perspective structural view of the system of the present invention
- FIG. 2 is a general structural diagram of the present invention
- FIG. 3 is a flow chart of an embodiment of a Cerenkov fluorescence tomographic image reconstruction module of the present invention
- FIG. 4 is a schematic diagram of a tomographic image reconstruction process according to an embodiment of the present invention
- FIG. 5 is a spatial position registration relationship diagram of optical and structural images according to an embodiment of the present invention
- FIG. 6 is a three-dimensional position of a medical isotope distribution intensity maximum body unit in a structural image of Cherenkov fluorescence tomographic reconstruction according to an embodiment of the present invention
- Fig. 7 is a diagram showing the Cherenkov fluorescence tomographic image of the embodiment of the present invention and three orthogonal cut charts showing the maximum value. detailed description
- the present invention includes a Cerenkov Luminescence detecting device (101), a computer (109), and a black box (110), which relate to a structural imaging device (102 and 103) and a bed (104, 105). , 106, 107, 108), the physical object is supported on the bed body, for example, a human body, an animal or any imaged physical object, and the bed body is simply referred to as a small animal bed.
- the Cerenkov fluorescence detection device (101) is a key component of the system of the present invention, including a CCD with a typical operating temperature of -110°.
- the structural imaging device is a high-resolution micro-CT imaging system, which is orthogonal to the Cerenkov fluorescence detector on the air-cushion optical platform;
- the black box (110) is single-sided by lead glass, The upper and lower bottom surfaces and the remaining three sides are closed squares composed of lead plates, the inner surface of which is covered with a layer of black professional paint;
- the bottom of the black box (110) is provided with a zigzag circular hole with a diameter of 1 cm, allowing passage through the data line.
- the Cerenkov fluorescence detecting device (202) is a rotatably selected band pass filter (205), a CCD device for performing Cerenkov optical signal-electric signal conversion, and an optical imaging controller ( 207).
- the optical imaging controller (207) refers to a computer-connected communication that adjusts the center wavelength and bandwidth of the bandpass filter, the operating temperature of the CCD device, the frame rate of the data acquisition, the exposure time, the aperture opening and closing, and the optical system parameters of the aperture. Hardware controller.
- the in-vivo small animal imaging bed device (203) includes a small animal support (208) for fixing an imaged object, a 360-degree rotating table (208) for three-dimensionally adjusting the position of the imaged object, and an orthogonal translation guide (211). ), and a small animal bed controller (212).
- the small animal bed controller (212) is a hardware controller that communicates with the computer to automatically adjust the position of the three-dimensional space of the imaged object.
- the structural imaging device micro-CT (204) includes an X-ray source (213), an X-ray detector (214), and a micro-CT controller (215).
- the micro-CT controller (215) refers to a hardware controller that regulates the micro-CT imaging device and communicates with the computer.
- the optical imaging controller (207) transmits the optical image acquired by the CCD to a computer (219) to obtain a planar optical image (216).
- the Micro-CT controller (215) transmits the imaging object structure information acquired by the X-ray detector to the computer (219) to obtain a three-dimensional structure image (218).
- the computer (219) outputs through the Cherenkov fluorescence image reconstruction process based on the planar optical image (216) and the three-dimensional structural image (218). Cherenkov fluorescence tomography image (217).
- the computer (219) located outside the black box not only controls the entire imaging system, but also an execution module of image processing, and the output result image includes a planar optical image (216), a three-dimensional structure image (217), and a Cherenkov fluorescence tomographic image. (218).
- the key part of the method of the present invention means that after the computer (301) acquires the planar optical image (302) and the three-dimensional structural image (303), the following steps can be taken to obtain Cerenkov.
- Step 304 Perform spatial position registration on the optical image (302) collected by the multi-angle and the structural image (303) based on the fixed marker point, and establish a mapping table of the geometric position relationship of the optical-CT.
- Step 305 Establish according to step 304.
- the geometric position mapping table converts the gray intensity of each pixel of the planar optical image into light intensity (unit: number of photons / (mm 2 ⁇ s)) and maps to the surface of the three-dimensional small animal to form the surface light signal intensity Distribution map B;
- Step 306 The collected micro-CT image is subjected to image segmentation processing, and the main organs of the imaged object are segmented and given different pixel values to distinguish, for example, the heart, kidney, liver, bone, muscle, bladder, etc. are usually segmented;
- Step 307 Discretize the segmented volume data outputted in step 306 using a finite element method, and output a volume mesh, such as a commonly used tetrahedral mesh;
- p (l- f )/
- Step 311 If the target function value F K ⁇ V after the image update is iterated in step K , the iterative calculation is stopped, and the final reconstruction result image, Cherenkov fluorescence tomographic image (312), where V is the target threshold constant, is output.
- the present invention is shown in Figure 4 using 2-fluoro-2-deoxy -D--glucose (18 F-FDG) into tomographic
- the implementation steps are as follows: a 23g healthy female nu/nu nude mouse is in a 2% isoflurane medical anesthetic gas and sleeps peacefully.
- the small animal CT contrast agent Fenestra LC 0.2ml and 11.1 MBq 18 F-FDG set in vivo micro-CT imaging system parameters, the scanning X-ray emitting source voltage is 50kV, power 50W, detector integration time 0.467s, the rotational speed of the turntable 1.07s, a single frame of the projected image size 1120x2344, the imaging time of a single frame 3.0s, 360 projections, CT scan after 30 minutes of drug injection to obtain three-dimensional structure image;
- Set Cerenkov optical in-vivo imaging system parameters CCD exposure time is 3min, aperture pseudo 2.8, focal length 55mm, imaging object and The distance between the lenses is 15cm, the pixel combined value is 2, and the optical scanning is performed after 60 minutes of drug injection.
- the optical filter is not used in the experiment.
- the small animal turntable is imaged once every 90 degrees to obtain a planar optical image.
- the CT imaging registration and fusion steps establish a surface intensity map B, where the surface triangle grid contains: 1934 nodes, 3899 patches; Dividing, can separate the kidney, bone, bladder, muscle and other tissues, wherein the geometric center position of the bladder is (34.7mm, 14.5mm, 5.0mm), and the surface mesh is discretized through the finite element mesh to establish a tetrahedron Grid, the number of nodes 3952, the number of sides 25778, the number of triangular patches 42471, the number of tetrahedrons 20844; According to the imaging method of the present invention, after the detected surface intensity distribution and the volume mesh are established, the weighting of the mixed spectrum is selected. Coefficients are used as optical property parameters of complex biological tissues to reconstruct CLT images and characterize the isotope distribution in vivo.
- the spatial position registration is performed, and the registration distance between the optical mark point and the micro-CT mark point is displayed in the same image. error.
- 601 indicates the kidney
- 602 indicates the bone
- 603 indicates the bladder
- 604 indicates the tetrahedral unit having the largest fluorescence intensity value after CLT reconstruction
- the 604 geometric center position is (34.4mm, 13.2mm, 4.7mm), located inside the bladder
- 605 indicates muscle.
- the CLT image obtained by applying the method of the present invention that is, the in-body distribution of 18 F-FDG
- 309 indicates the position of the above three cutaway images in the CLT image
- CLT reconstruction constant /7 125
- the light intensity is normalized to the 0-1 range
- the entire CLT image reconstruction time is less than 0.65 s; according to the micro-CT structural data analysis, and the FDG is uniformly distributed in the bladder light, etc.
- the tomographic reconstruction error of the imaging method of the present invention is 1.4 mm.
- the invention can realize in-vivo three-dimensional imaging of radiopharmaceuticals, and provides a low-cost molecular imaging tool for molecular nuclear medical imaging research and clinical application thereof.
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- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Nuclear Medicine (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Measurement Of Radiation (AREA)
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201080059913.0A CN102741707B (zh) | 2010-12-23 | 2010-12-23 | 基于切伦科夫效应的断层成像方法 |
| PCT/CN2010/002141 WO2012083503A1 (zh) | 2010-12-23 | 2010-12-23 | 基于切伦科夫效应的断层成像方法和系统 |
| US13/519,863 US9008397B2 (en) | 2010-12-23 | 2010-12-23 | Tomography system based on Cerenkov luminescence |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2010/002141 WO2012083503A1 (zh) | 2010-12-23 | 2010-12-23 | 基于切伦科夫效应的断层成像方法和系统 |
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| CN (1) | CN102741707B (zh) |
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| Publication number | Publication date |
|---|---|
| CN102741707A (zh) | 2012-10-17 |
| CN102741707B (zh) | 2014-04-23 |
| US20130259339A1 (en) | 2013-10-03 |
| US9008397B2 (en) | 2015-04-14 |
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