Barb J. Keller
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2016-439 – Medicare reimbursement for anesthesia services is currently dependent on a complex set of rules which include the rank of the anesthesia provider and the number of concurrent rooms supervised. Initial analyses show that Medicare non-compliance can result in a ~5% loss of gross revenue in the anesthesia department. Mayo Clinic investigators have developed a tool that tracks operating rooms in... Read More
2016-142 – Surgical training using educational models generally involves explaining surgical techniques through verbalization. This training method can be ineffective for visual learners. Mayo Clinic investigators have developed an augmented reality environment that is designed to provide students with real time verbal and visual feedback. This web-based system projects a trainee’s view of a surgical... Read More
2014-379 – The global hearing aid market is a multi-billion dollar industry. Although this industry is lucrative, market penetration is very low, primarily due to high cost and the stigma associated with hearing aids. These barriers limit the number of users that could benefit from hearing assistance technologies. Mayo Clinic investigators have developed a low-cost, non-invasive hearing solution that... Read More
2014-026 – A peak velocity estimator algorithm for flow phantom spectra. This peak velocity estimator has been adapted for use with Doppler velocity spectra from string phantoms.
2013-186 – The PET imaging agent F-18 sodium hexafluorophosphate (Na[18F]PF6) for hNIS expression in tumors.
2010-312 – The invention relates to the treatment of meningiomas using a composition including a cytotoxic agent and a compound selected from phenylbenzothiazole derivatives, stilbene derivatives, and biphenylalkyne derivatives.
2013-081 – Magnetic resonance imaging (MRI) is widely used to diagnostically investigate the human body. However, unlike other medical imaging modalities (e.g., X-ray CT), MRI data is not explicitly quantitative - pixel values do not directly represent physiological information. There is strong clinical interest in transforming MRI into a quantitative modality, and to measure quantities such as flow,... Read More
2013-056 – The invention is a method to prepare hydroxamate resin for use in metal ion separations.
2012-224 – Increase in bladder stiffness could be associated with various pathophysiologic conditions. We introduce Ultrasound Bladder Vibrometry (UBV), a novel method for rapid and noninvasive measurement of bladder wall viscoelasticity. UBV uses acoustic radiation force to excite mechanical waves in the bladder wall and track the motion using ultrasound pulse-echo techniques. Fourier domain analysis... Read More
2012-221 – Ultrasound radiation force is used to create propagating waves in soft tissue or other soft materials. The wave propagation is measured using pulse-echo ultrasound methods. We use a two-dimensional Fourier transform method to obtain the Fourier-space (k-space) with the coordinates of frequency (f) and wave number (k). The wave velocity © at each frequency is calculated by finding the... Read More
2012-153 – The practice of radiology is a non-linear process where image processing and routing decisions for best practice are often done by humans on the fly. Commercial PACS and image processing workstations assume a fixed workflow that is enshrined in their database schemas, and may only account for 4-5 stages in the lifetime of a diagnostic imaging study. DEWEY uses DICOM (with proposed expansion... Read More
2012-141 – Carpal tunnel syndrome (CTS) is a common problem with an estimated lifetime risk of 10%, a prevalence of about 3%, and a large economic burden of more than $1 billion annually for direct medical costs. It has been commonly recognized that carpal tunnel pressure (CTP) increases in CTS patients. However, measurement of CTP is invasive and not reliable due to technical difficulties. Although CTP... Read More
2012-134 – Shear wave produced by a focused ultrasound beam is used to evaluate tissue visco-elasticity, which are sensitive biomarkers of pathology. Shear waves thus produced are weak and attenuate quickly when propagating away from the push origin. We have proposed a method called CUSE where multiple unfocused push beams spaced out like a comb are used for shear wave production. Every pixel under... Read More
2012-129 – A method to quantify tissue viscoelastic properties in a model-independent way by estimating the complex shear modulus from creep-recovery response and shear wave propagation speed by ultrasound acoustic radiation force. This method uses a formula that converts creep-recovery response in time to frequency domain complex modulus. The shear wave speed is used to calibrate the complex modulus... Read More
2012-083 – Coronary CT angiography (cCTA) is used to noninvasively look at the arteries that supply the heart muscle with blood, and diagnose (or rule out) blocked arteries, which are the main cause of heart attacks. cCTA is performed with either prospective or retrospective ECG gating. Irrespective of which variant is used, images are reconstructed with projection data corresponding to a partial scan... Read More
2012-057 – Shear wave is used to evaluate tissue visco-elasticity, which are sensitive biomarkers of pathology. In order to obtain a 2D ultrasound elastography, an ultrafast imager with a FRAME rate of several kHz is required to capture the fast moving shear waves. This is not feasible with traditional ultrasound imagers with a frame rate of less than 100 Hz where 2D images are formed LINE BY LINE. ... Read More
2012-029 – Biomarkers capable of detecting early, rapidly progressing, or subtle alterations of cardiac right ventricular (RV) load could substantially contribute to timely diagnosis and effective treatment of RV disorders, which in same cases could escalate to severe or even life threatening conditions, such as acute pulmonary embolism. This invention describes novel RV shape biomarkers sensitive to... Read More
2011-274 – The invention uses ultrasound to measure the nonlinear mechanical properties of an object including those of biological tissues. This information can be used to detect abnormalities in tissues.
Individualized CT Scan Protocols for Scanning with Either Lower Radiation Dose or Lower IV Contrast Dose
2011-229 – We developed a technique for creating individualized CT protocols that allow patients to be scanned with either lower radiation dose or lower intravenous contrast dose whilst maintaining iodine contrast-to-noise ratio and diagnostic image quality.
2011-224 – A method to quantify tissue mechanical properties in a model-independent way by estimating complex elastic modulus from time-dependant creep response induced by acoustic radiation force. This method uses a formula that converts time-domain creep compliance to frequency domain complex modulus. Then Shearwave Dispersion Ultrasound Vibrometry (SDUV) is used to calibrate the complex modulus so... Read More
2011-210 – Multiple short-duration ultrasound push pulses are used to deform tissue. The duration and PRF (Pulse Repetition Frequency) of these push pulses are compatible with current ultrasound scanners because these pulses are comparable to Doppler pulses. The collective effect from many push pulses generates shear waves of high amplitude for elasticity imaging. Two shear waves are produced: one at... Read More
2011-178 – Radiation dose from CT scanning is an increasing health concern, but lowering radiation dose alone generally produces a noisier image and may degrade diagnostic performance. Non-local means (NLM) denoising has become widely accepted as a very effective denoising tool in the image processing community, and has yielded very promising results in lung and abdominal CT. However, NLM requires an... Read More
2011-114 – In dynamic time series imaging, noise varies from image to image, but the underlying structure (although it can vary somewhat) is generally preserved. Techniques that take advantage of this are capable of efficiently denoising such data sets. In this invention, time series images are decomposed into overlapping subblocks of size NxN, with each subblock sampled T times in the time dimension.... Read More
2011-108 – Parallel Imaging is a widely used strategy for accelerating MRI acquisitions. Auto-calibrated coil-by-coil methods such as GRAPPA and ARC have become increasingly popular since they do not require a separate calibration scan (as do SENSE and ASSET) nor explicit estimation of coil sensitivity profiles, making them attractive for time-limited and dynamic applications like cardiac imaging.... Read More
Method for Reconstructing Dynamic Resonance Imaging Series From Limited Measurements Using Matrix Rank Constraints
2011-106 – This disclosure allows for image series to be reconstructed from only a subset of the data normally required to form the image series, and correspondingly for image acquisition time to be reduced. As demonstrated, the proposed reconstruction mechanism can provide improved temporal fidelity compared to other rank-based MRI series reconstruction methods.
2011-080 – The quantitative accuracy of CT numbers in myocardial perfusion computed tomography (MPCT) is degraded by artifacts arising from the use of partial scan reconstruction (PSR), which is used in cardiac CT to improve temporal resolution. Full scans do not suffer from this artifact. PSR artifacts appear because of inconsistencies in the angular range of projection data used for partial scans due... Read More
2011-026 – Propagation of shear wave (e.g., frequency dependent propagation speed and attenuation) in tissues is determined by mechanical properties of tissues. In ultrasound elasticity imaging, focused ultrasound beams are used to generate and detect shear waves in tissues. The 3D shape of the ultrasound beam can artificially increase measured shear wave speed in the transducer near field and... Read More
2011-002 – Nonfocused ultrasound waves are produced by merely transmitting long tonebursts on each of several elements in a linear or curved or phased array. This produces an unfocused beam. Shearwave can be imaged by beams from a two-dimensional array if a shearwave is produced in a rectangular section, then the shearwaves can propagate away from the rectangular section and can be imaged. The effect... Read More
2010-299 – Molecular breast imaging (MBI) is a molecular imaging technique that can be used for the detection of breast cancer. MBI can detect breast tumors not visible on mammography or ultrasound. MBI images usually take 5-10 minutes to acquire 1 view. A slant-hole collimator can be used to estimate tumor depth and enable tumor biopsy using a radiolabeled guide. However, the long imaging time of 5-10... Read More
2010-220 – Radiation therapy treatment is used in nearly two-thirds of all cancer patients. Accurate targeting of the tumor over the treatment period is critical to effective therapy. Placement of permanent tattoos is the current standard practice to aid in the alignment and targeting of radiation therapy over multiple treatments. Existing tattoo methods involve the use of freehand needle sticks,... Read More
2010-115 – Photon counting detector technology is being actively adopted for commercial CT. One compelling reason is the advantages that it brings for spectral imaging (multi-energy CT) which allows material characterization using energy information from the detected x-rays. The ability to identify material composition regardless of material density (e.g. distinguishing iodine from bone even though they... Read More
2010-108 – SDUV is a non-invasive ultrasound technology that can qualify tissue stiffness and viscosity, which are sensitive indexes of pathology such as liver fibrosis. SDUV uses one long push toneburst of ultrasound followed by multiple detect pulses to generate and detect shear waves in tissue. Shear wave propagation information is used to estimate tissue stiffness and viscosity. The push-detect... Read More
2010-038 – The individual cross-sectional images along the arteries were analyzed individually by creating a Region-of-Interest (ROI) that encompassed the vessel wall. To ensure that the entire arterial wall was included into the ROI, the radius of the lumen ® was measured, which was used as the width of the annular ROI surrounding the arterial lumen (12). By creating a binary image of the punctate... Read More
2010-032 – A method for producing tissue motion with customized frequency content is described in which push pulses are designed using orthogonal basis functions which then produce desired tissue motion. The push pulses can be a sequence of long duration, in which case motion detection A-lines can be interleaved among the pulses. The result is a more efficient method of making tissue move with optimal... Read More
Use of Pittsburgh Compound B (PiB) Molecules and PiB-Positron Emission Tomography/Computed Tomography (PiB-PET/CT) Imaging for the Identification and Diagnosis of Meningiomas
2010-007 – Meningiomas are a common tumor often found in the thin layers of tissue that surround the brain. However, many other types of tumors can arise in the same locations. Variation in the appearance of meningiomas can make the accurate diagnosis of meningioma difficult based on current methods, such as Computed Tomography (CT) and Magnetic Resonance Imaging (MRI). Pathologists can accurately... Read More
2009-366 – A method and system for producing 3-dimensional ultrasound images of a patient’s breast and also producing planar emission images from a radiopharmaceutical is described. The system allows perfect co-registration of both the ultrasound image and the emission image, thereby allowing comparison of anatomical and functional features of the breast tissue. The system comprises 3 primary components... Read More
Improved Quality for Magnetic Resonance Spectroscopy Spectra Using Eigenvalve Deconvolution and Special Lower Triangular Matrix of Time Activity Data
2009-323 – Eigenvector decomposition allows consistent eigenvalues to be produced from different data set acquisition of the same sample material.
2009-309 – The general method has been discussed in “System and Method for Phone Offset and Time Delay Correction in Magnetic Resonance Spectroscopy Data”. (2007-100). Here it is added that the magnitude of the real imaging parts of the data are used for the spectrum.
2009-281 – An ultrasound imaging system transmits a train of pulses along each scan line. The pulses are reflected at various depths and interfaces (objects). In color Doppler mode, the reflected signals from the corresponding scan line and depth correlated frame by frame. A loss of correlation is interpreted as object displacement and indicated by a color overlay. Even if an object does not move... Read More
2009-280 – Sonometry is real-time distance measurement between two piezoelectric crystals by the time of flight of an acoustic signal, transmitted by one and received by the other crystal. Three “locator” crystals define a plane. Another “navigator: crystal can be instantaneously spatially located by the distances from the "locator” crystals.
2009-278 – Specific and highly sensitive ultrasound localization of catheter placement can be accomplished by use of a catheter navigation crystal with an active (vibrating) element whose ultrasonic signal interferes with the ultrasound imaging signal as the latter propagates with each transmitted bearn though issue. The interference signal (caused by the crystal) occurs directly within the Doppler... Read More
2009-275 – Technology Description Neuroradiologists’ ability to successfully interpret MR angiography images is enhanced when projection images called Maximum Intensity Projection (MIP) renderings are independently generated for the three main vascular structures in the head. Currently, this process is performed manually by the MR technician immediately following the acquisition of an MR angiography... Read More
2009-264 – Conventionally, nuclear medicine gamma cameras employ an energy window centered in the primary gamma ray energy emitted by the radioisotope being detected. For example, with Tc-99m, a 20% energy window (from 126-154 keV) is centered on the 140 keV gamma rays. At lower energies, scatter within the patient and the gamma camera degrade image quality and these events are not considered useful. ... Read More
2009-259 – The spectra are improved by correcting for the distortion caused by 1. The distance for sample to detect 2. Time delay between excitation of the sample and initial recording of the spectra 3. The physical size of the volume of the sample emitting the signal. Details in separate write up.
2009-191 – In MR and CT imaging, any reduction in scan time offers potential benefits ranging from high temporal rate observation of physiologic processes to reduction of motion artifacts to lower radiation dose (for CT) to improve patient comfort and throughput. With compressing sensing (CS) techniques, certain classes of MR and CT images can be accurately reconstructed from highly undersampled (and... Read More
2009-179 – For certain types of time series CT studies, Prior Image Constrained Compressed Sensing (PICCS) has been shown to significantly reduce the number of required data samples that must be acquired, thereby reducing the radiation dose to patients. PICCS is based on standard compressed sensing L1-norm minimization techniques. An alternative homotopic L0-based minimization technique developed... Read More
2009-083 – MR Spectroscopy data is analyzed to yield high quality spectral images. Multiple acquisitions of MRS data are combines. The images are combined by time a phase shifting the data in the time domain (equivalent to interpolation) so that the data points all coincide on the same set of frequency points after fourier transforming. This avoids cancelation of the desired signal that would occur... Read More
2009-049 – Technology Description Due to the rapid increase in use of CT imaging and the recently-heightened awareness of radiation-induced cancer, improving the diagnostic quality of low dose CT has become increasingly important. The signal-to-noise level of low dose CT scans is significantly lower than for normal dose scans, and thus may cause a decrease in diagnostic accuracy. Mayo Clinic... Read More
2009-048 – Technology Description Intracranial aneurysms represent a difficult to detect cause of morbidity and mortality. Digital subtraction angiography is considered the gold standard for intracranial aneurysm detection, but this technique is associated with risk of neurologic complications. 3D time-of-flight magnetic resonance angiograpy (MRA) has recently emerged as a non- invasive screening... Read More
2009-047 – A complex set of gestures which, when performed using a screen pointer, facilitate fast and accurate selection of radial menu items from a radial menu.