Chun Bin Lim, 8455 W Juniper Ln, Moreland Hls, OH 44022

5633499, May 27, 1997

Nov 21, 1995

8/561273

Chun B. Lim - Moreland Hills OH
Barry D. Kline - Cleveland Heights OH
Vitaliy Rappoport - Solon OH

Trionix Research Laboratory, Inc. - Twinsburg OH

G01T 117

25036307

Scatter errors are eliminated from a gamma camera image on a spatially dependent basis. A global scatter curve is obtained and normalized for each local area. Based on this local scatter curve and the local spectrum, a local correction factor is obtained. The correction factors are then used to remove scatter errors from the image. The method provides spatially-dependent correction based on measured scatter. It does not require the camera's zero-scatter response to be known and it does not require the fitting of spectra either by a polynomial or by a theoretical scatter function. It allows for rapid determination of scatter correction factors for each pixel in an image. It produces excellent results for both transmission and emission images.

4582995, Apr 15, 1986

Jun 18, 1984

6/621418

Chun B. Lim - Solon OH
Richard L. Chaney - Cuyahoga Falls OH
Roger J. Kump - Mentor OH

Technicare Corporation - Solon OH

G01T 1166

250363S

A method for correcting predictable errors in the location of detected scintillation events acquired during emission computed tomography by a rotational scintillation gamma camera system. The method includes calibrating the rotational scintillation camera system and generating a look-up table comprising a set of pairs of x and y offset values, one pair for each viewing angle. The calibration reflects systemic deviations in the location of the rotating camera head detector measured in terms of x and y coordinates in the frame of reference of the detector for a plurality of view angles relative to the geometric ideal expected path. Once a look-up table is generated for a camera system, the detected location of each gamma event is altered in real time by adjusting in the camera head the x,y coordinate location of each event by the x,y offset values previously generated for the corresponding viewing angle associated with the detected event.

5491342, Feb 13, 1996

Nov 10, 1994

8/338438

Chun B. Lim - Moreland Hills OH
Barry D. Kline - Cleveland Heights OH
Jinghua J. Jiang - Streetsboro OH
Vitaliy Rappoport - Mayfield Heights OH

Trionix Research Laboratory, Inc. - Twinsburg OH

G01T 1161
G12B 1300

25036309

A gamma camera is calibrated at different photon energies to provide several different calibration arrays. The calibration arrays are used to correct the camera image according to the energy of the photons detected from the body to be examined. The calibration array obtained from the photons having an energy closest to the photons detected from the body may be used. Another alternative is to form an interpolation array based on two or more calibration arrays obtained with photons having energies bracketing those from the body.

5319205, Jun 7, 1994

Nov 27, 1992

7/982483

Barry D. Kline - Cleveland Heights OH
Constantine Fantanas - Grand River OH
Sarkis Barsamian - Solon OH
Chun Lim - Solon OH

Trionix Research Laboratory, Inc. - Twinsburg OH

G01T 120

25036304

An imaging detector on a medical imager is provided with a proximity sensor for automatically maintaining a desired distance from the subject to be imaged. The proximity sensor is formed from three infrared beams at decreasing distances from the imaging detector. The imaging detector is moved toward the subject until the first two beams are interrupted. If the third beam is interrupted, the imaging detector is moved back from the subject until only the first beam is interrupted. Faults are detected by monitoring the order in which the beams are interrupted, whether the beams are interrupted when the imaging detector is fully retracted, and whether beams are present when no signal is applied to the beam emitters.

5107121, Apr 21, 1992

Mar 26, 1991

7/679173

Chun B. Lim - Solon OH
Rick W. Walker - Kent OH
Robert E. Sobin - Cleveland OH
Carlos D. Pinkstaff - Twinsburg OH

Trionix Research Laboratory, Inc. - Twinsburg OH

G01T 1166

25036305

A gantry and pallet assembly using scintillation cameras to acquire data emitted from radiopharmaceuticals previously introduced into a patient. The radiopharmaceuticals accumulate in a predetermined region of interest within the patient. The gantry can perform both whole body and single photon emission computed tomograph (SPECT) scans. The gantry has two scintillation cameras mounted in a diametrically opposed manner on and in close proximity to a rotation ring. Each camera can be radially translated relative to the rotation ring simultaneously with the rotation of the rotation ring. The gantry is capable of being translated along a pair of translation tracks so that a pallet upon which a patient lies passes therethrough. The pallet assembly has a storage carriage which supports a substantially rectangular flat pallet upon a slidable frame, and a curved pallet upon an extension assembly. The storage carriage can be slid away from the gantry or close to the gantry.

4808826, Feb 28, 1989

Apr 8, 1986

6/849324

Chun B. Lim - Solon OH
Richard Chaney - Cuyahoga Falls OH
Felix Jih - Cleveland OH
Tim Johnson - Cleveland OH
Steven E. King - Springfield VA

Technicare Corporation - Solon OH

G01T 120
G06F 1542

250363R

In scintillation cameras, spatial or linearity correction is accomplished utilizing a weighted average of correction vectors in the region of the apparent location of scintillation events. Such vectors are developed in a calibration step using a pinhole or slot apertured mask. On the fly, vectors beyond those next adjacent the apparent location are used for correction, which are constrained to exhibit continuity in both the functional value, and at a minimum the first derivative, but which may include continuity in higher order derivatives also. One such correction function, which insures continuity in both the functional value and its first derivative, is called a Hermite interpolation function.