Charles L Saylor

US Patent:

6865494, Mar 8, 2005

Filed:

Dec 18, 2002

Appl. No.:

10/323135

Inventors:

G. Randy Duensing - Gainesville FL, US
Charles Saylor - Gainesville FL, US
Feng Huang - Gainesville FL, US

Assignee:

MRI Devices Corp. - Gainesville FL

International Classification:

G06F019/00

US Classification:

702 38, 702104, 702179, 702198, 324439, 324633, 324722, 7333505, 600409, 600411

Abstract:

The subject invention pertains to an imaging technique and apparatus which can utilize an array of RF probes to measure the non-resonant thermal noise which is produced within a sample, such as a body, and produce a non-resonant thermal noise correlation. The detected noise correlation is a function of the spatial overlap of the electromagnetic fields of the probes and the spatial distribution of the conductivity of the sample. The subject technique, which can be referred to as Noise Tomography (NT), can generate a three-dimensional map of the conductivity of the sample. Since the subject invention utilizes detection of the thermal noise generated within the body, the subject method can be non-invasive and can be implemented without requiring external power, chemicals, or radionuclides to be introduced into the body. The subject imaging method can be used as a stand along technique or can be used in conjunction with other imaging techniques.

US Patent:

7145339, Dec 5, 2006

Filed:

Oct 7, 2005

Appl. No.:

11/245500

Inventors:

Charles A. Saylor - Gainesville FL, US
G. Randy Duensing - Gainesville FL, US

Assignee:

Invivo Corporation - Gainesville FL

International Classification:

G01V 3/00

US Classification:

324318, 324322

Abstract:

The subject invention pertains to a technique and device that can isolate and separate resultant electromagnetic fields of volume coils at high frequency. In an embodiment, an RF shield can be used to isolate and separate resultant electromagnetic fields. In an embodiment, the shield can have a cylindrical shape that can form a partially closed volume in which an object to be imaged, or sample, can be inserted. In an embodiment, the RF shield can be part of a RF coil. In a specific embodiment, some parts of a volume coil can be inside a shield, and the other parts of a volume coil can be outside the shield. The shielding of some of the parts of a volume coil can create conductor patterns corresponding to the specific parts inside the shield and the specific parts outside the shield. In an embodiment, two or more conductor patterns can be placed in proximity to the same shield and either be driven independently, driven together, or act as receiving elements, combined or uncombined. This embodiment is advantageous because the combination of conductor patterns can be optimized by the flexibility of separating the fields of end-rings from the fields of leg currents.

US Patent:

7253622, Aug 7, 2007

Filed:

Jan 17, 2006

Appl. No.:

11/334241

Inventors:

Charles A. Saylor - Gainesville FL, US
Yu Li - Gainesville FL, US

Assignee:

Invivo Corporation - Gainesville FL

International Classification:

G01V 3/00

US Classification:

324318, 600422

Abstract:

Embodiments of the subject invention can utilize a single coil structure for dual-mode operation. In a specific embodiment, a single coil structure can be used as a volume coil in the transmitting phase and as a phase array in the receiving phase. In an embodiment, a transmit coil array in accordance with the subject invention can be utilized for one or more of the following: ) parallel RF excitation on an MRI scanner equipped with a multiple-channel transmitter; ) serial RF excitation with the use of a switch system with a single channel transmitter; and ) generation of a homogeneous Bfield for regular MRI with the use of a power splitter on a standard scanner. In a specific embodiment, the use of a concentric double loop coil with different tunings of inner and outer loops can be implemented. In an embodiment, the coil elements can be decoupled using the CRC mode of a concentric double loop coil. In an embodiment, a surface coil transmit array can provide better compatibility with a receive array.

US Patent:

7345482, Mar 18, 2008

Filed:

Jan 17, 2006

Appl. No.:

11/334811

Inventors:

Charles A. Saylor - Gainesville FL, US

Assignee:

Invivo Corporation - Gainesville FL

International Classification:

G01V 3/00

US Classification:

324318, 324322

Abstract:

Embodiments of the invention pertain to a resonator for use in magnetic resonance imaging. Embodiments of the subject invention pertain to a high-field mode-stable resonator for use in magnetic resonance imaging. Embodiments also pertain to a method of generating and/or receiving rf magnetic fields in a field of view (FOV) for magnetic resonance imaging. An embodiment can incorporate a shielded cylindrical resonator having 16 elements that are coupled to one another by a transmission line resonator.

US Patent:

20080154116, Jun 26, 2008

Filed:

Dec 22, 2006

Appl. No.:

11/644183

Inventors:

G. Randy Duensing - Gainesville FL, US
Charles A. Saylor - Gainesville FL, US

International Classification:

A61B 5/0402
A61B 5/055

US Classification:

600410, 600509

Abstract:

Embodiments of the subject invention relate to a method and apparatus for obtaining an electrocardiogram (ECG) signal. Embodiments can separate a true ECG signal from one or more signals due to electric fields caused by moving electrical charges. In a specific embodiment, an ECG signal can be separated from one or more electric fields caused by blood flow. An embodiment pertains to a joint MRI and diagnostic ECG system. In an embodiment, the joint diagnostic quality ECG can add information to a MRI cardiac study. This additional information can be useful for MR guided intervention treatments, such as locating tissue that created bad electrical arrhythmia. In an embodiment, the subject method and apparatus can be utilized to obtain an ECG for patient located in a magnetic field of 1.5 T or higher, such as in MRI systems with 1.5 T or higher magnetic fields. Embodiments of the invention can use flow encoding with a changing magnetic field, with dense electrical sensors and inversion of the EEG data, utilizing this information to extract the flow related signals. Further, inversion to the source distribution of the flow related signals can be accomplished.

US Patent:

20140077811, Mar 20, 2014

Filed:

May 16, 2012

Appl. No.:

14/118272

Inventors:

Wei Lin - Gainseville FL, US
Charles Albert Saylor - Gainesville FL, US
Arne Reykowski - Gainesville FL, US

Assignee:

KONINKLIJKE PHILIPS N.V. - EINDHOVEN

International Classification:

G01R 33/565

US Classification:

324309, 324318, 324322

Abstract:

A magnetic resonance system includes a magnetic resonance scanner () and a magnetic resonance scan controller (). A plurality of markers () are attached to the subject to monitor motion of a portion of a subject within an examination region. A motion control unit receives motion data from the markers indicative of the motion and controls the magnetic scan controller to adjust scan parameters to compensate for the motion. In one embodiment, the marker () includes a substance () which resonates at a characteristic frequency in response to radio excitations by the magnetic resonance scanner. A controller () switches an inductive circuit () disposed adjacent the substance between a tuned state and a detuned state. In another embodiment, the motion sensor includes an accelerometer, a gyroscope, a motion sensor, or a Hall-effect element, and a controller () which gathers motion data generated by the element and provides temporary storage for the motion data. A communication unit () transmits the motion data wirelessly.