-
公开(公告)号：US10478089B2
公开(公告)日：2019-11-19
申请号：US15837233
申请日：2017-12-11
Applicant: DENTSPLY SIRONA Inc.
Inventor： Ciamak Abkai , Tim Braun , Jan Paul , Volker Rasche
Abstract: Disclosed herein is a method for capturing a dental object with an object volume, in particular, at least one part of a maxilla and/or a mandible, with the sue of an MRT apparatus. A plurality of MRT segment images, which depict the defined segmented volume regions are acquired by an MRT apparatus within a measurement volume of the MRT apparatus. The segmented volume regions overlap no more than partially. In this case a target surface is defined or has already been defined. Then a two dimensional composite image, which corresponds to a two dimensional aggregate image through the target surface within the object volume of the dental object, is generated computer-aided from the individual MRT segment images.
-
公开(公告)号：US20180160932A1
公开(公告)日：2018-06-14
申请号：US15837233
申请日：2017-12-11
Applicant: DENTSPLY SIRONA Inc.
Inventor： Ciamak ABKAI , Tim Braun , Jan Paul , Volker Rasche
CPC classification number: A61B5/055 , A61B5/4547 , A61B5/7278 , A61B5/742 , A61B5/7425 , A61B6/14 , A61B2576/02 , A61C9/0046 , G06T5/50 , G06T7/0014 , G06T11/008 , G06T2207/10088 , G06T2207/10116 , G06T2207/30036
Abstract: Disclosed herein is a method for capturing a dental object with an object volume, in particular, at least one part of a maxilla and/or a mandible, with the sue of an MRT apparatus. A plurality of MRT segment images, which depict the defined segmented volume regions are acquired by an MRT apparatus within a measurement volume of the MRT apparatus. The segmented volume regions overlap no more than partially. In this case a target surface is defined or has already been defined. Then a two dimensional composite image, which corresponds to a two dimensional aggregate image through the target surface within the object volume of the dental object, is generated computer-aided from the individual MRT segment images.
-
公开(公告)号：US11116444B2
公开(公告)日：2021-09-14
申请号：US16466316
申请日：2017-12-06
Applicant: DENTSPLY SIRONA inc.
Inventor： Volker Rasche , Stefan Wundrak
IPC: A61B5/00 , A61B90/00 , A61B5/055 , A61B5/11 , A61B6/00 , A61C19/045 , G01R33/56 , G01R33/563 , G01R33/58
Abstract: Described is a method for detecting and displaying the movement of a temporomandibular joint which connects a lower jaw and an upper jaw by magnetic resonance imaging. A marker is secured to the lower jaw, a marker movement curve is generated using magnetic resonance imaging measurement data sets during a first measurement interval, during which the lower jaw is moved relative to the upper jaw, and a point which corresponds to a first position of the lower jaw relative to the upper jaw is ascertained on the movement curve. An image data set is generated during a second measurement interval, during which the temporomandibular joint is not moved, and a first model, which represents at least one part of the upper jaw and/or a temporal bone part that comprises the temporomandibular joint socket, and a second model, which represents at least one part of the lower jaw, are ascertained therefrom. A movement curve of the second model relative to the first model is calculated and displayed using the marker movement curve.
-
公开(公告)号：US10386437B2
公开(公告)日：2019-08-20
申请号：US15517282
申请日：2015-10-07
Applicant: DENTSPLY SIRONA inc.
Inventor： Stefan Wundrak , Volker Rasche
IPC: G01R33/56 , G01R33/561 , G01R33/48 , G01R33/565
Abstract: Disclosed herein is a method for generating an MRI image in which a radial or spiral k-chamber path with a constant angular increment Psi is used to take an MRI image, the angular increment Psi being in the angular range of between 5-55 degrees or being in the corresponding supplementary angle Psi′ and is selected according to the formula PsiN,M=pi/(N+1/(M+tau−1)). Alternatively, for an angular increment Psi which deviates from the angle increment of the optimal distribution of n radial profiles Psiopt=180°/n, the minimum scanning efficiency of the angular increment Psi for n>21 profiles is greater than 0.95, the angular increment Psi is in an angular range of 5° to less than 68.7537°, in particular between 5-55 degrees or in the corresponding supplementary angle Psi′. Compared to the arrangement of the radial or spiral profile using the golden angle of 111.24°, the angle increments calculated according to the above formula lead to lower eddy current artifacts, for example during the use of a b-SSFP-pulse sequence.
-
-
-
Search Results
4
records
(took 0.013 seconds)
