WO2009053896A2 - Closed loop registration control for multi-modality soft tissue imaging - Google Patents
Closed loop registration control for multi-modality soft tissue imaging Download PDFInfo
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- WO2009053896A2 WO2009053896A2 PCT/IB2008/054315 IB2008054315W WO2009053896A2 WO 2009053896 A2 WO2009053896 A2 WO 2009053896A2 IB 2008054315 W IB2008054315 W IB 2008054315W WO 2009053896 A2 WO2009053896 A2 WO 2009053896A2
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- volume image
- image
- ultrasound
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- higher dimension
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/30—Determination of transform parameters for the alignment of images, i.e. image registration
- G06T7/38—Registration of image sequences
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10081—Computed x-ray tomography [CT]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10088—Magnetic resonance imaging [MRI]
- G06T2207/10092—Diffusion tensor magnetic resonance imaging [DTI]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10132—Ultrasound image
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10132—Ultrasound image
- G06T2207/10136—3D ultrasound image
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30084—Kidney; Renal
Definitions
- the present application relates to the diagnostic imaging arts. It finds particular application in conjunction with targeted prostate biopsies and therapy in which advancement of the biopsy needle is monitored in real time with ultrasound and the real- time ultrasound images are registered with a previously generated diagnostic image, such as a MR or CT image, and will be described with particular reference thereto.
- a previously generated diagnostic image such as a MR or CT image
- the present technique is applicable to the kidney, other organs, other types of soft tissue, and to other imaging modalities.
- TRUS-guided needle biopsy is the most frequently used method for diagnosing prostate cancer due to its real-time nature, low cost, and simplicity.
- TRUS Transrectal ultrasound
- the use of ultrasound to detect prostate cancer is limited by its relatively poor image quality and by its low sensitivity to prostate and other cancers. That is, ultrasound images provide little, if any, differentiation between cancerous tissues and adjacent tissues.
- the lack of sonographic visibility by prostate and other cancers creates uncertainty as to whether the potentially cancerous tissue has, in fact, been biopsied. It is estimate that TRUS-guided biopsy fails to detect the presence of prostate cancer correctly in approximately 20% of cases.
- imaging modalities such as magnetic resonance imaging
- magnetic resonance imaging provides superior differentiation of prostate and cancerous tissues.
- magnetic resonance imaging is costly, typically not real-time, and awkward or difficult to use, making it undesirable for routine biopsy guidance.
- Magnetic resonance and ultrasound images have been fused or registered.
- reliable automated registration of real-time ultrasound images and volume MR images has proved elusive.
- Simple visual comparison without joint, side-by-side or fused display is today the gold standard for using pre-acquired magnetic resonance images during realtime ultrasound-guided procedures..
- the present application describes a new and improved apparatus and method which overcomes these problems and others.
- an image registration apparatus receives a 3D diagnostic volume image of a target area generated by a scanner.
- An ultrasound volume image memory stores a 3D ultrasound volume image of the target area.
- a localizer and registration unit determines a baseline transform that brings the 3D diagnostic volume image and the 3D ultrasound image of the target area into registration.
- An image adjustment processor adjusts at least a selected portion of the diagnostic volume image in accordance with the baseline transform.
- a method of semi-automatically registering a 3D diagnostic volume image of a target region with a 3D ultrasound volume image of the target region is provided. Registration along a first dimension or subset of dimensions is automatically optimized. A display depicting the 3D diagnostic image and the 3D ultrasound volume image registered in the first dimension is presented. At least one of a manual adjustment to the registration or operator approval of the registration is received. These steps are repeated for each of a plurality of additional dimensions. A baseline transform is determined which registers the 3D diagnostic volume image and the 3D ultrasound volume image.
- an image registration method is provided.
- a 3D diagnostic volume image of a target region and a 3D ultrasound volume image of the target region are registered to generate a baseline transform which transforms the 3D diagnostic and ultrasound volume images into registration.
- a series of real-time ultrasound images are generated.
- the real-time ultrasound images are registered with the 3D diagnostic image to generate a motion correction transform which transforms at least a portion of the 3D ultrasound volume image and the real-time ultrasound image into registration.
- At least a corresponding portion of the 3D diagnostic volume image is operated on with the baseline transform and the motion correction transform to bring at least the corresponding portion of the 3D diagnostic volume image into registration with the real-time ultrasound image.
- Another advantage of the present application resides in the real-time intra-operative registration of ultrasound images and a three-dimensional volume image, e.g., a magnetic resonance or CT image.
- Another advantage resides in improved guidance accuracy in soft tissue biopsies.
- Another advantage is that the accuracy of the image fusion is determined only by the image registrations, which is independent of the tracking system. Another advantage is that fusion accuracy is not affected by the metal distortion of the electromagnetic field of the tracking system.
- Another advantage is that the system does not need any fiducials for registration.
- the invention may take form in various components and arrangements of components, and in various steps and arrangements of steps.
- the drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
- FIGURE 1 is a diagrammatic illustration of a closed loop registration control
- FIGURE 2 is a diagrammatic illustration of a semi-automatic image registration process; and, FIGURE 3 describes a method of real-time image registration.
- a 3D diagnostic volume image of a target region such as a magnetic resonance (MR) image or CT image is generated by a scanner 10 and stored in a diagnostic volume image memory 12.
- the 3D diagnostic volume image of the target region is generated prior to a biopsy procedure.
- 4D and higher dimensional images are also contemplated.
- images of an organ that moves cyclically can be generated in four dimensions with the fourth dimension being time or position in the cycle.
- the 3D diagnostic volume image may be generated, for example, in a magnetic resonance imaging system immediately prior to the biopsy procedure, hours, days, or weeks prior to the biopsy procedure, or even months or more in advance.
- the 3D diagnostic volume image is generated with the patient in the same physical position as the patient will be in during the biopsy.
- a 3D ultrasound volume image of the same region is generated in preparation for the procedure and stored in an ultrasound volume image memory 20.
- a plurality of two-dimensional ultrasound images is generated using a two-dimensional ultrasound scanner 22 and compiled into the 3D ultrasound volume image. Using the same scanner to generate the 3D ultrasound volume image and two-dimensional real-time images is advantageous in that it provides inherent alignment characteristics from the common position of the ultrasound sensor.
- a localizer and registration unit 30 is connected with the diagnostic volume image memory 12 and the ultrasound volume image memory 20 to receive the corresponding 3D volume images therefrom.
- the localizer and registration unit and registration determines a baseline transform T base which registers the 3D diagnostic volume images and 3D ultrasound volume images.
- the baseline transform describes the transformation which can operate on the 3D diagnostic volume image to transform it into full alignment with the 3D ultrasound volume image.
- the baseline transform is provided to an image adjustment processor or program 32 which can transform the 3D diagnostic volume image or a portion of it into registration with the 3D ultrasound volume image. This registration can be iteratively performed until an optimal baseline transform is generated.
- the localizer and registration unit 30 includes one or more processors 34 which are programmed to perform automatic or semiautomatic registration methods.
- the localizer and registration unit is connected with a display 36 for showing superimposed images and an operator input device 38, such as a mouse or keyboard, to receive instructions from a clinician for improving registration of the superimposed images during manual or semiautomatic registration procedures.
- Various localization techniques can be utilized to determine the baseline transform. This can be a manual technique, an automatic technique, or a semi-automatic technique.
- FIGURE 2 describes an advantageous semi-automatic technique. Rather than trying to align the 3D diagnostic volume image and the 3D ultrasound volume image in all dimensions concurrently, which tends to fall into local minima, the technique of FIGURE 2 performs the alignment independently along each dimension or small subset of the dimensions.
- the registration processor 42 optimizes the registration along one dimension, e.g., the x-dimension. This optimization may be based on any of various similarity measures, such as surface-based registration, image-based registration, mutual information-based registration, correlation ratio-based registration, or other similarity measures.
- an operator reviews the registration, performs a manual adjustment 44, if necessary, and approves 46 the first dimension registration. This process is repeated with an automated optimization of the next dimension, e.g., the y-dimension 48, manual adjustment 44, if necessary, and approval 50.
- automated optimization 52 along a third translation optimization dimension, e.g., the z-dimension is performed, any appropriate manual adjustments performed 44, and the translation approved 52.
- an automated rotational optimization 54 is performed about one dimension, e.g., about the x- axis. Manual adjustments 44, if necessary, are performed and the registration approved. This same process is repeated for rotational optimization 56, 58 about other dimensions, e.g., the y- and z-dimensions, manual adjustments are made 44, if needed, and the registrations are approved 60, 62.
- additional registrations in additional dimensions can be performed such as magnification/minification, non-rigid registrations, and the like. Each such additional dimension registration is again manually adjusted, if necessary, and approved by the clinician. If the clinician is satisfied with the registered images, the registration is completed 64.
- the clinician sends 66 the registration back to start 40 and the process is repeated. This process can be iteratively repeated until the clinician is satisfied with the alignment. It should be noted that different similarity measures can be used in each iteration or in different dimensions in the same iteration. After the automated alignment along any dimension, the clinician can determine that the similarity measure used by the automated registration process did not work optimally, select a different similarity measure, and re-run the automatic registration process along that dimension again. As another alternative, the registration optimization may be performed relative to more than one dimension or parameter at a time, e.g., a subset of the dimensions to be registered. As another alternative, some registration dimensions can be skipped either initially or on the iterations. The decision to skip can be manually input or based on defined or user preference settings.
- the real-time ultrasound scanner 22 generates a series of real-time two- dimensional ultrasound images during the biopsy procedure. These 2D real-time ultrasound images optionally are stored in a buffer 70. Each individual slice or groups of slices in the nature of slab are conveyed to the localizer and registration unit 30.
- the localizer and registration unit 30 registers the slice or slab ultrasound images from the two- dimensional real-time ultrasound scanner 22 with a corresponding portion of the 3D ultrasound volume image from the ultrasound volume image memory 20 and determines a corresponding motion correction transform T motlOn which brings these two ultrasound images into registration.
- the localizer and registration unit 30 determines the motion correction transform T motlOn which transforms the corresponding portion of the 3D ultrasound volume image into registration with the real-time ultrasound image(s). Because the localizer and registration unit 30 compares ultrasound images with ultrasound images, there are a variety of similarity measures that can be utilized successfully in automatic registration processes, such as the similarity measures listed above.
- each real-time ultrasound image is generated, it is conveyed in real-time to an image fuser 72.
- the real-time ultrasound scanner determines a geometry and location relative to the target region of each real-time 2D or slice ultrasound image.
- This slice information is transmitted to the image adjustment processor 32 which causes the image transform processor to retrieve and transform a corresponding slice or other portion of the 3D diagnostic volume image with the baseline transform T base and the most recently determined motion correction transform T motlOn .
- the transformed slice or other portion of the 3D diagnostic volume image is conveyed to the fuser 72. In this manner, the corresponding portion of the 3D diagnostic volume image is transformed into alignment with each real-time ultrasound slice or 2D image in real-time.
- the fused images are conveyed to a display 74 for display.
- the motion correction transform T motlOn can be generated after each real-time ultrasound image, after a preselected number of the real-time ultrasound images, or upon an operator request to update the motion correction transform.
- the localizer and registration unit 30 determines a measure of the similarity between the 3D ultrasound volume image and the real-time ultrasound images.
- This similarity measure is converted by a video display processor 76 into appropriate format for display on the display 74.
- This similarity measure may be displayed in a graphic display 80 which moves from low to high to indicate the current degree of similarity. Alternately, the similarity measure can be displayed as a number or percentage.
- the similarity measure is compared 82 with a threshold 84. If the similarity measure becomes dissimilar beyond a preselected threshold, a warning is conveyed to the technician performing the biopsy.
- the display can be in the form of a blinking or colored warning light 86 which appears on the display 74.
- the 3D diagnostic volume image such as a MR or CT image
- a plurality of 2D ultrasound images is generated 92 and merged into a 3D ultrasound volume image 94.
- the 3D diagnostic volume image and the 3D ultrasound volume image are registered 96 to generate a baseline transform Tb ase .
- the registration process is performed in accordance with method of FIGURE 2 described above.
- a series of real-time ultrasound images is generated 98.
- Each real-time ultrasound image or group of real-time ultrasound images is registered 100 with the 3D ultrasound volume image or a corresponding portion of it to develop a motion correction transform T motlOn .
- the 3D diagnostic volume image or a portion corresponding to the real-time ultrasound image is transformed 102 in accordance with the baseline and motion correction transforms.
- Each real-time ultrasound image is fused with the corresponding portion of the transformed 3D diagnostic volume image 104.
- the slice from the 3D diagnostic volume image is not limited to orthogonal slices but includes oblique slices, and the like. Non-planar slices and slabs are also contemplated.
- Each of the real-time ultrasound images is displayed 106 fused with the corresponding portion of the 3D diagnostic image.
- the registration 100 of the real-time and 3D ultrasound volume images also generates a signal indicative of the similarity measure which is also displayed.
- the similarity measure is compared with the threshold 108 and, if the similarity measure is dissimilar beyond the threshold, a warning is presented to the clinician in the display step 106.
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JP2010530602A JP5449175B2 (en) | 2007-10-26 | 2008-10-20 | Closed-loop registration control for multi-modality soft tissue imaging |
CN2008801128927A CN101836236B (en) | 2007-10-26 | 2008-10-20 | Closed loop registration control for multi-modality soft tissue imaging |
EP08841370.3A EP2203892B1 (en) | 2007-10-26 | 2008-10-20 | Closed loop registration control for multi-modality soft tissue imaging |
US12/679,026 US8885897B2 (en) | 2007-10-26 | 2008-10-20 | Closed loop registration control for multi-modality soft tissue imaging |
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US98282407P | 2007-10-26 | 2007-10-26 | |
US60/982,824 | 2007-10-26 |
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WO2009053896A3 WO2009053896A3 (en) | 2009-06-04 |
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US (1) | US8885897B2 (en) |
EP (1) | EP2203892B1 (en) |
JP (1) | JP5449175B2 (en) |
CN (1) | CN101836236B (en) |
WO (1) | WO2009053896A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
CN101836236A (en) | 2010-09-15 |
US20130039555A1 (en) | 2013-02-14 |
WO2009053896A3 (en) | 2009-06-04 |
EP2203892A2 (en) | 2010-07-07 |
EP2203892B1 (en) | 2017-04-12 |
JP5449175B2 (en) | 2014-03-19 |
JP2011500250A (en) | 2011-01-06 |
US8885897B2 (en) | 2014-11-11 |
CN101836236B (en) | 2013-08-21 |
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