National Taiwan University

Academia Sinica

Sampo Corporation

Jyh-Horng Chen

Tzi-Dar Chiueh

Edzer Lienson Wu

Li-Wei Kuo

Yun-An Huang

Chii-Wann Lin

Chien-Yuan Lin

Tzu-Kan Chen

Chen Chang

Feng-Chi Yang

Chyr-Pwu Tzou

Tzi-Dar Chiurh

A method and apparatus for single carrier wideband magnetic resonance imaging (MRI) data acquisition are provided. The method includes the following steps: exciting a slice or slab with the use of RF pulse and a slice/slab selection gradient; applying a phase encoding gradient along a phase encoding direction and reducing a FOV along the phase encoding direction by a factor of W through k-space subsampling; applying a frequency encoding gradient along a frequency encoding direction and increasing a FOV along the frequency encoding direction by a factor of W; and applying a separation gradient along the phase encoding direction during the frequency encoding duration and k-space data acquisition.

Method and apparatus for single carrier wideband magnetic resonance imaging (MRI) data acquisition

The present invention discloses a 3-dimension magnetic resonance imaging method which comprises: applying a slab selection gradient to a subject; transmitting a radiofrequency pulse to the subject, and exciting a slab of the subject to produce magnetic resonance signals with a continuous frequency bandwidth; performing a spatial encoding gradient across three dimensions to encode the magnetic resonance signals, wherein an equivalent encoded field of view which along the selected acceleration direction is controlled by the spatial encoding gradient, and the equivalent encoded field of view is shorter than the excited slab size of the subject; applying a separation gradient along with the spatial encoding gradient; and receiving and reconstructing the encoded magnetic resonance signals to produce 3D images.

Method and apparatus for 3D magnetic resonance imaging

A method and an apparatus for enhancing signals in magnetic resonance imaging are provided. The method includes the following steps. Applying one or more than one RF pulse, which carries at least two frequency components, and a slice/slab selection gradient to a subject, so that at least two slices/slabs of the subject respectively corresponding to the at least two frequency components are excited simultaneously. Applying a plurality of spatial encoding gradients and one or more than one separation gradients for separating the at least two slices/slabs. Receiving a plurality of responsive RF signals excited from the subject. The responsive RF signals are restored according to a signal restoration function.

Method and apparatus for enhancing signal in magnetic resonance imaging

A method for acquiring MRI signals includes: applying one or more than one RF pulse, which carries at least two frequency components, and a slice/slab selection gradient to a subject, so that at least two slices/slabs of the subject respectively corresponding to the at least two frequency components are excited simultaneously; applying a plurality of spatial encoding gradients; applying a plurality of separation gradients for separating the at least two slices/slabs; and applying at least one coherent refocusing gradient between the plurality of separation gradients.

Method and apparatus for acquiring magnetic resonance imaging signals

A diffusion imaging method is provided. The diffusion imaging method includes performing a plurality of data collection sequences. Each data collection sequence includes applying an excitation radio frequency signal and a selection gradient. The excitation radio frequency signal includes a first set of frequency bands selected to simultaneously excite a first nuclei type in a plurality of cross sections of a subject. Each data collection sequence further includes applying a diffusion gradient during formation of a magnetic resonance signal, applying a spatial encoding gradient during formation of the magnetic resonance signal, and while acquiring the magnetic resonance signal, applying a separation gradient to change a frequency separation between portions of the magnetic resonance signal. The diffusion imaging method further includes computationally determining a diffusion image of each of the plurality of cross sections.

Simultaneous diffusion imaging of multiple cross sections

A method comprises performing a first T2-weighted imaging (T2WI) on a subject; injecting the subject with a contrast agent after performing the first T2WI; and waiting a predetermined period of time before performing a second T2WI on the subject. The first T2WI and second T2WI are then co-registered. The co-registered first T2WI and co-registered second T2WI are then trimmed. A &#x394;Rmap is then determined based on each pixel of the trimmed first T2WI and corresponding pixels of the trimmed second T2WI. A three-dimensional map is constructed based on the &#x394;Rmap.

Three-dimensional microscopic magnetic resonance angiography

Each micro electrode of a high-density micro electrode array is connected to the same conducting wire. Serial switches enable sequential electrical connection of the micro electrode array. Given reasonable temporal resolution, the separation interval of two consecutive instances of the same micro electrode entering the ON state matches the temporal resolution. The micro electrode array has simple layout and small area, thereby maximizing the number of micro electrodes installed per unit area.

High-density micro electrode array and serial control method thereof

A magnetic resonance imaging (MRI) method is provided, including the steps of generating a wideband RF signal that has a plurality of frequency bands respectively corresponding to a plurality of different kinds of nuclei, to simultaneously excite the different kinds of nuclei, detecting a wideband responsive RF signal that has a plurality of frequency bands respectively emitted by the different kinds of nuclei, and reconstructing magnetic resonance images for the different kinds of nuclei based on the wideband responsive RF signal. An MRI apparatus employing the MRI method is also provided.

Wideband magnetic resonance imaging apparatus and method

Provided is a method for simultaneously acquiring magnetic resonance slices/slabs of a subject. The method comprises steps as follows. First, apply one or more than one RF pulse, which carries at least two frequency components, and a slice/slab selection magnetic field gradient so that at least two slices/slabs of the subject respectively corresponding to the at least two frequency components are excited simultaneously. Second, apply a spatial encoding magnetic field gradient. Third, apply a slice/slab separation magnetic field gradient so as to separate the at least two slices/slabs. The method according to the present invention can be used to acquire data for simultaneously reconstructing multiple slices/slabs. The method is compatible with existing MRI systems.

Method and apparatus for simultaneously acquiring multiple slices/slabs in magnetic resonance system

A method of using a single pick-up head to read and store data in discs of different thickness, especially for CD (compact disc) and DVD (digital versatile disc), the method including the step of adjusting the electronic aperture ring to change the numerical aperture, and change the distance between the disc and the object lens subject to type of the disc used.

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Taipei, Taiwan

Jyh-Horng Chen