# US 9,435,898 B2 · Dedicated cardiac PET

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- Number: US 9,435,898 B2
- Document ID: US9435898B2
- Status: Granted
- Kind: B2
- Application number: 14/358,832
- Filed: 2012-11-16
- Published: 2014-10-16
- Granted: 2016-09-06
- Earliest claimed: 2011-11-17
- Assignees: The Board of Trustees of the Leland Stanford Junior University
- Applicants: The Board of Trustees of the Leland Stanford Junior University
- Inventors: Peter D. Olcott; Craig Steven Levin
- Web page: https://patentgrep.com/patent/US9435898B2

## CPC

- G01T 1/202: the detector being a crystal
- A61B 6/037: {Emission tomography}
- A61B 6/4233: {using matrix detectors}
- A61B 6/508: {for non-human patients}
- G01T 1/164: Scintigraphy
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A detector is provided. A plurality of scintillation crystals is provided, where each scintillation crystal has a width, and wherein a first plurality of scintillation crystals is placed adjacent to each other so that first surfaces of the first plurality of scintillation crystals form a first rectangular surface. A reflective coating is formed over the first rectangular surface with an open region grid pattern, wherein each open region forms a space wherein each space has a width equal to the width of a scintillation crystal of the plurality of crystals. A plurality of photodetectors is provided, wherein each photodetector is placed over a space, wherein the photodetector has a width greater than the width of the space over which the photodetector is placed. At least one electronic readout is electrically connected to the plurality of photodetectors.

## Claims

### Claim 1

A detector comprising:
a plurality of scintillation crystals, where each scintillation crystal of the plurality of scintillation crystals has a width, and wherein each scintillation crystal of the plurality of scintillation crystals is placed adjacent to each other so that first surfaces of the plurality of scintillation crystals form a first rectangular surface; and
a reflective coating over the first rectangular surface with an open region grid pattern, wherein each open region forms a space wherein each space has a width equal to the width of a scintillation crystal of the plurality of scintillation crystals; and
a plurality of photodetectors wherein each photodetector of the plurality of photodetectors is placed over a space, wherein the photodetector has a width greater than the width of the space over which the photodetector is placed; and
at least one electronic readout electrically connected to the plurality photodetectors.

### Claim 2 (depends on 1)

The detector, as recited in claim 1, wherein each scintillation crystal of the plurality of scintillation crystals is rectangular prisms.

### Claim 3 (depends on 2)

The detector, as recited in claim 2, wherein each photodetector is a solid state photomultiplier.

### Claim 4 (depends on 3)

The detector, as recited in claim 3, wherein the at least one electronic readout has a time-of-flight time resolution of less than 300 ps when using a LSO or LYSO scintillation crystal.

### Claim 5

The detector, as recited in 4, wherein each scintillation crystal of the plurality of scintillation crystals has a length of at least 8 mm.

### Claim 6 (depends on 5)

The detector, as recited in claim 5, wherein each scintillation crystal of the plurality of scintillation crystals has a first photodetector of the plurality of photodetectors and a second photodetector of the plurality of photodetectors.

### Claim 7 (depends on 1)

The detector, as recited in claim 1, wherein the plurality of scintillation crystals are used in a positron emission tomography (PET) scanner, further comprising a processor that receives said emission signals from the at least one electronic readout of the plurality photodetectors and processes said signals into a three dimensional reconstruction.

### Claim 8 (depends on 1)

The detector, as recited in claim 1, wherein each photodetector is a solid state photomultiplier.

### Claim 9 (depends on 1)

The detector, as recited in claim 1, wherein the at least one electronic readout has a time-of-flight time resolution of less than 300 ps when using a LSO or LYSO scintillation crystal.

### Claim 10

The detector, as recited in 1, wherein each scintillation crystal of the plurality of scintillation crystals has a length of at least 8 mm.

### Claim 11 (depends on 1)

The detector, as recited in claim 1, wherein each scintillation crystal of the plurality of scintillation crystals has a first photodetector of the plurality of photodetectors and a second photodetector of the plurality of photodetectors.

### Claim 12 (depends on 11)

The detector, as recited in claim 11, further comprising a processor for depth-of-interaction determination using signal amplitude recorded from both the first photodetector and second photodetector.

### Claim 13 (depends on 1)

The detector, as recited in claim 1, wherein each photodetector of the plurality of photodetectors has a width that is equal to the square root of two times with width of the scintillation crystals.

### Claim 14 (depends on 13)

The detector, as recited in claim 13, where each photodetector of the plurality of photodetectors is adjacent to an end of a scintillation crystal.