Patents by Inventor Roland Proksa

Roland Proksa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190336086
    Abstract: An interferometer grating support (118) of an imaging system (100) configured for grating-based x-ray imaging includes at least two elongate supports (302) separated from each other by a non-zero distance, wherein the at least two elongate supports have a first end (312) and a second end (316). The grating support further includes a first arc shaped grating (202) affixed to the first end and a second arc shaped grating (204) affixed to a second end (316). A non-transitory computer readable medium is configured with computer executable instructions which when executed by a processor of a computer cause the processor to: move a grating support, which supports G0 and G1 gratings of an interferometer and a bowtie filter, into a region between a low energy photon filter and a beam collimator, which are between a radiation source and an examination region, for a grating-based x-ray imaging scan.
    Type: Application
    Filed: November 30, 2017
    Publication date: November 7, 2019
    Applicant: KONINKLIJKE PHILIPS N.V.
    Inventors: ROLAND PROKSA, THOMAS KOEHLER
  • Publication number: 20190313991
    Abstract: The present invention relates to an apparatus for generating multi energy data from phase contrast imaging data. It is described to provide (210) phase contrast X-ray image data of a region of interest of an object. Attenuation X-ray image data of the region of interest of the object is also provided (220). A first basis data set is generated (230) from the phase contrast X-ray image data. A second basis data set is generated (240) from the phase contrast X-ray image data and the attenuation X-ray image data.
    Type: Application
    Filed: November 9, 2017
    Publication date: October 17, 2019
    Inventor: Roland PROKSA
  • Patent number: 10441230
    Abstract: The invention relates to a projection data acquisition apparatus (31) for acquiring projection data. The projection data acquisition apparatus comprises a radiation device (32) for generating a pulsed radiation beam (4) for traversing an object and a detection device (6) for generating projection data being indicative of the pulsed radiation beam (4) at different acquisition positions, wherein the radiation device (32) is adapted to generate the pulsed radiation beam (4) such that at different acquisition positions the pulsed radiation beam (4) has different shapes, i.e. is differently blocked and/or attenuated. Thus, not the complete radiation providable by the radiation device is used at each acquisition position, but at least at some acquisition positions only a smaller pulsed radiation beam is used. This can lead to less scattered radiation and hence to improved projection data and an improved computed tomography image, which may be reconstructed based on the acquired projection data.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: October 15, 2019
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roland Proksa, Michael Grass
  • Publication number: 20190298292
    Abstract: The invention relates to a system (1) for assisting in assessing a state of a subject's lung. The system is adapted to process a dark field image, which comprises dark field values for different spatial positions and for different breathing state values, such that a differentiation image is generated by differentiating the provided dark field image with respect to the breathing state values. This differentiation can lead to a functional image which can be used for detecting changes of air-soft tissue interfaces, which might be caused by a lung disease, with high sensitivity. This allows for an improved assisting in assessing a state of a subject's lung.
    Type: Application
    Filed: December 21, 2017
    Publication date: October 3, 2019
    Inventor: Roland PROKSA
  • Patent number: 10426417
    Abstract: An imaging system (200) includes a radiation source (208) that emits radiation that traverses an examination region. The imaging system further includes a hybrid data acquisition system (212) that receives radiation that traverses the examination region. The hybrid data acquisition system includes a phase-contrast sub-portion (304) spanning a sub-portion of a full field of view. The hybrid data acquisition system further includes at least one of an integrating portion (302, 702, 804, 806, 902) or a spectral portion (402, 704, 706, 802, 1002) spanning the full field of view. The hybrid data acquisition system generates a phase-contrast signal and at least one of an integration signal or a spectral signal. The imaging system further includes a reconstructor (216) that reconstructs the phase-contrast signal and at least one of the integration single or the spectral signal to generate volumetric image data indicative of the examination region.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: October 1, 2019
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Michael Grass, Thomas Koehler, Roland Proksa
  • Publication number: 20190290222
    Abstract: A method of an image processing apparatus for identifying a type of adipose body tissue within a subject, based on performing a spectral computed tomography (CT) scan of a region of interest of the subject; and using a combination of different image processing techniques to differentiate between at least two adipose tissue types within the region of interest.
    Type: Application
    Filed: July 13, 2017
    Publication date: September 26, 2019
    Inventors: Roland PROKSA, Heiner DAERR, Daniela FRANZ
  • Patent number: 10420519
    Abstract: The invention relates to a computed tomography system (30). Several sets of spectral projections, which correspond to different positions of a radiation source (2) along a rotation axis (R), are decomposed into first projections being indicative of a contrast agent and second projections being not indicative of the contrast agent. An image is generated by a) determining for each first projection a contrast value being indicative of a total amount of contrast agent and scaling the first projections such that for different first projections of a same set the same contrast value is determined, and reconstructing an image based on the scaled first projections, and/or b) reconstructing for the different sets first images, scaling the first images such that they have a same intensity in overlap regions and combining the scaled first images. Thus, different contrast agent amounts can be balanced, thereby allowing for an improved image quality.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: September 24, 2019
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Thomas Koehler, Roland Proksa, Michael Grass
  • Publication number: 20190239842
    Abstract: The invention relates to a system for providing images for detecting an endoleak after a stent graft has been placed within the aorta of a person at a stent graft location. First and second contrast agents are injected at first and second times (T1, T2) and first, second and third computed tomography images of the stent graft location showing a) the first contrast agent, b) the second contrast agent and c) the stent graft and tissue, respectively, are reconstructed based on spectral projection data acquired at a third time (T3). By using these computed tomography images for detecting an endoleak, the endoleak detection can be significantly improved, wherein this improved endoleak detection can be provided with a relative low radiation dose, because the images can be reconstructed by using only the computed tomography scan at the third time.
    Type: Application
    Filed: June 29, 2017
    Publication date: August 8, 2019
    Inventors: Roland PROKSA, Peter Benjamin NOEL, Daniela MUENZEL, Julia DANGELMAIER
  • Patent number: 10368819
    Abstract: The present invention relates to improved assessment of a stenosis in a blood vessel in a body by comparing hemodynamic properties of the stenosed blood vessel with a substantially symmetric different blood vessel in the same body.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: August 6, 2019
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Michael Grass, Roland Proksa
  • Publication number: 20190216416
    Abstract: A source grating structure (G0) for interferometric X-ray imaging cable of generating a non-uniform intensity profile behind a surface (S) of the grating structure when exposed to X-ray radiation.
    Type: Application
    Filed: August 30, 2017
    Publication date: July 18, 2019
    Inventors: Thomas KOEHLER, Roland PROKSA
  • Publication number: 20190183443
    Abstract: The present invention relates to computer tomography X-ray imaging. In order to provide further improved data for the reconstruction, a system (10) for computer tomography X-ray imaging is provided. The system comprises a data interface (12) and a processing unit (14). The data interface is configured to provide at least first and second CT X-ray radiation projection data for at least a first and second X-ray energy range, which ranges are different from each other. The processing unit is configured to determine a correction for slice normalization, and to apply an equal slice normalization for the first and the second CT X-ray projection data and thereby generating prepared first and second CT X-ray projection data. For the correction, the equal slice normalization is based on measured data of outer detector elements. Further, the data interface is configured to provide the prepared first and second CT X-ray projection data for further processing.
    Type: Application
    Filed: September 4, 2017
    Publication date: June 20, 2019
    Inventors: Bernhard Johannes BRENDEL, Thomas KOEHLER, Roland PROKSA
  • Publication number: 20190133541
    Abstract: The present invention relates to an apparatus for generating X-rays. It is described to produce (210) with a power supply (30) a voltage. A cathode (22) of an X-ray source (20) is positioned (220) relative to an anode (24) of the X-ray source. Electrons are emitted (230) from the cathode. Electrons emitted from the cathode interact (240) with the anode with energies corresponding to the voltage. X-rays are generated (250) from the anode, wherein the electrons interact with the anode to generate the X-rays. The X-ray source is controlled (260), such that a plurality of first X-ray pulses is generated each having a first X-ray flux, wherein the first X-ray pulses are temporally separated from each other. The X-ray source is controlled (270), such that a least one second X-ray pulse is generated having a second X-ray flux that is substantially less than the first X-ray flux, wherein the at least one second X-ray pulse is generated temporally between consecutive pulses of the first X-ray pulses.
    Type: Application
    Filed: May 24, 2017
    Publication date: May 9, 2019
    Inventors: Roland PROKSA, Daniela MUENZEL
  • Patent number: 10269146
    Abstract: A method displays spectral image data reconstructed from spectral projection data with a first reconstruction algorithm and segmented image data reconstructed from the same spectral projection data with a different reconstruction algorithm, which is different from the first reconstruction algorithm. The method includes reconstructing spectral projection data with the first reconstruction algorithm, which generates the spectral image data and displaying the spectral image data. The method further includes reconstructing the spectral projection data with the different reconstruction algorithm, which generates segmentation image data, segmenting the segmentation image data, which produces the segmented image data, and displaying the segmented image data.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: April 23, 2019
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roland Proksa, Rafael Wiemker, Liran Goshen, Shlomo Gotman
  • Publication number: 20190116654
    Abstract: The present invention relates to an apparatus for generating X-rays. It is described to produce (210) with a power supply (40) at least two voltages between at least one cathode (20) and an anode (30), wherein the at least two voltages comprises a first voltage and a second voltage. The at least one cathode is positioned relative to the anode. Electrons are emitted (220) from the at least one cathode. Electrons emitted from the at least one cathode are interacted (230) with the anode with energies corresponding to the at least two voltages. X-rays are generated (230) from the anode, wherein the electrons interact with the anode to generate the X-rays. First X-rays are generated when the power supply produces the first voltage and second X-rays are generated when the power supply produces the second voltage. The power supply is controlled (250), such that a ratio between the first X-rays and the second X-rays is controllable.
    Type: Application
    Filed: March 21, 2017
    Publication date: April 18, 2019
    Inventors: LESTER DONALD MILLER, NIRMAL SONI, ROLF KARL OTTO BEHLING, ROLAND PROKSA, DIONYS VAN DE VEN
  • Publication number: 20190105003
    Abstract: The present invention relates to a projection values determination device (14) being adapted to determine a projection value for an x-ray of a cone beam (4) based on detection values generated by detection elements of a three-dimensional arrangement of detection elements, which have been traversed by the x-ray, and not based on a detection value generated by a detection element which has not been traversed by the x-ray. Hence, the projection values determination device does not determine a projection value for a respective x-ray based on a detection value generated by a detection element not traversed by the respective x-ray. In particular, also in the cone direction only detection values are considered for generating a projection value, which have been generated by detection elements which have really been traversed by the respective x-ray. This can lead to reduced cross talk and computed tomography images having an improved image quality.
    Type: Application
    Filed: January 19, 2017
    Publication date: April 11, 2019
    Inventors: Michael GRASS, Roland PROKSA
  • Patent number: 10143434
    Abstract: The invention relates to an imaging system (17) like a computed tomography system for generating an image of an object. Spectral measured projection data and non-spectral measured projection data are generated by a detector (6) having spectral detection elements and non-spectral detection elements, and spectral estimated projection data are estimated by using a model material distribution which could have caused the non-spectral measured projection data and by simulating a measurement of the spectral estimated projection data based on the model material distribution. An image is reconstructed based on the measured and estimated spectral projection data. Using the spectral estimated projection data in addition to the spectral measured projection data can lead to high quality spectral imaging, especially high quality spectral computed tomography imaging, which uses a simplified detector not only having generally more complex spectral detection elements, but also having simpler non-spectral detection elements.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: December 4, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roland Proksa, Thomas Koehler
  • Publication number: 20180306932
    Abstract: A radiation detector (100) with a scintillator (102), a photosensor (104) and an electronics module (108) is proposed. The electronics module (108) has a current-to-frequency converter (110) with a charge integrator (112) for generating a pulsed signal in having a frequency correlating with a charge generated by the photosensor (104) during a measurement cycle. The electronics module (108) further comprises a current source (120) for generating a frequency offset of the pulsed signal, an interrupting device (134) for interrupting an integration of the charge by the charge integrator (112), and a logic module (124) for determining the frequency of the pulsed signal. Therein, the logic module (124) is configured for determining an off-state of a radiation (404) source and for triggering the interrupting device (134) upon determining the off-state of the radiation source (404).
    Type: Application
    Filed: September 5, 2017
    Publication date: October 25, 2018
    Inventor: Roland PROKSA
  • Publication number: 20180303436
    Abstract: The invention relates to a method of Computed Tomography imaging comprising: a. Performing a single acquisition of image data from at least two contrast agents into a blood vessel network, a first contrast agent among said at least two contrast agents having been in said blood vessel network for a longer time than a second contrast agent among said at least two contrast agents, b. Processing said image data using K-Edge detection and/or iodine delineation to separate data associated with each contrast agents in order to obtain a concentration map of each contrast agent, c. Determining from said image data a first part of the blood vessel network comprising both the first contrast agent and the second contrast agent, and a second part of the blood vessel network comprising only the first contrast agent, d. Calculating a partial blood volume map of the first part of the blood vessel network based on the total amount of second contrast agent and on the concentration map of the second contrast agent, e.
    Type: Application
    Filed: November 1, 2016
    Publication date: October 25, 2018
    Inventors: Roland PROKSA, Heiner DAERR, Daniela MUENZEL, Peter NOEL
  • Patent number: 10107921
    Abstract: A radiation detector (100) with a scintillator (102), a photosensor (104) and an electronics module (108) is proposed. The electronics module (108) has a current-to-frequency converter (110) with a charge integrator (112) for generating a pulsed signal in having a frequency correlating with a charge generated by the photosensor (104) during a measurement cycle. The electronics module (108) further comprises a current source (120) for generating a frequency offset of the pulsed signal, an interrupting device (134) for interrupting an integration of the charge by the charge integrator (112), and a logic module (124) for determining the frequency of the pulsed signal. Therein, the logic module (124) is configured for determining an off-state of a radiation (404) source and for triggering the interrupting device (134) upon determining the off-state of the radiation source (404).
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: October 23, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Roland Proksa
  • Publication number: 20180289350
    Abstract: A method of a virtual X-ray colonoscopy includes scanning (204) a dark-field contrast (144) insufflated colon lumen (140) with an X-ray scanner (110) configured for dark-field-contrast, which generates dark-field-contrasted projection data and attenuation projection data. The dark-field-contrasted projection data and the attenuation projection data are reconstructed (206) into one or more dark-field-contrasted images (148).
    Type: Application
    Filed: September 1, 2016
    Publication date: October 11, 2018
    Inventors: Roland PROKSA, Alexander André FINGERLE, Daniela MUENZEL, Franz Josef PFEIFFER, Thomas KOEHLER, Peter Benjamin Theodor NOEL, Maximilian VON TEUFFENBACH, Julia HERZEN, Konstantin WILLER