EMISSION COMPUTED TOMOGRAPHY DETECTOR ASSEMBLIES AND METHODS THEREOF
The present disclosure provides Emission Computed Tomography (ECT) detector assemblies and related methods. The ECT detector assemblies may include a detector micro-block, a detector block, etc. The detector micro-block may include detector units arranged side by side along a second direction. Each of the detector units may include crystal elements and an optical sensor array. The crystal elements may be arranged in crystal element rows along the second direction and crystal element columns along a first direction perpendicular to the second direction. Each crystal element may have a first end and a second end and extending from the first end to the second end along a third direction perpendicular to the first direction and the second direction. The optical sensor array may include optical sensors arranged along the first direction.
1 . A detector micro-block for emission computed tomography (ECT), comprising:
detector units arranged side by side along a second direction, wherein each of the detector units includes:
crystal elements that are arranged in crystal element rows along the second direction and crystal element columns along a first direction perpendicular to the second direction, each crystal element having a first end and a second end and extending from the first end to the second end along a third direction perpendicular to the first direction and the second direction; and
an optical sensor array including optical sensors arranged along the first direction; wherein
the first ends of the crystal elements in each crystal element row are optically coupled with one optical sensor of the optical sensor array, and
an optical bridge is configured at the second ends of the crystal elements in each crystal element column.
2 . The detector micro-block of claim 1 , wherein for each crystal element column of each detector unit,
an optical separator is configured between each pair of adjacent crystal elements in the crystal element column,
the optical separator extends from the first ends of the corresponding pair of adjacent crystal elements without reaching the second ends of the corresponding pair of adjacent crystal elements.
3 . The detector micro-block of claim 2 , wherein the second ends of the crystal elements in each crystal element column are integrated into an integral part that serves as the optical bridge.
4 . The detector micro-block of claim 2 , wherein the optical bridge of each crystal element column comprises:
a light transmitter configured between each pair of adjacent crystal elements in the crystal element column,
the light transmitter extends from the second ends of the corresponding pair adjacent crystal elements to the optical separator between the corresponding pair of adjacent crystal elements.
5 . The detector micro-block of claim 1 , wherein for each detector unit,
an optical separator is configured between each pair of adjacent crystal element columns in the detector unit,
the optical separator extends from the first ends of the crystal elements in the corresponding pair of adjacent crystal element columns to the second ends of the crystal elements in the corresponding pair of crystal element columns.
6 . The detector micro-block of claim 1 , wherein
for each crystal element column of each detector unit,
an optical separator is configured between each pair of adjacent crystal elements in the crystal element column, the optical separator extends from the first ends of the corresponding pair of adjacent crystal elements to the second ends of the corresponding pair of adjacent crystal elements, and
the optical bridge includes a light transmitter covering the second ends of the crystal elements in the crystal element column.
7 . The detector micro-block of claim 1 , wherein
a second optical bridge is configured between each pair of adjacent detector units in the detector micro-block.
8 . The detector micro-block of claim 1 , wherein
an optical separator is configured between each pair of adjacent detector units in the detector micro-block,
the optical separator extends from the second ends of the crystal elements in the corresponding pair of adjacent detector units without reaching the first ends of the crystal elements in the corresponding pair of adjacent detector units.
9 . The detector micro-block of claim 1 , wherein for each detector unit,
two crystal elements are arranged in each crystal element column of the detector unit along the first direction, and
two crystal elements are arranged in each crystal element row of the detector unit along the second direction.
10 . The detector micro-block of claim 1 , wherein each crystal element has a long side along the first direction and a short side along the second direction, the length of the long side along the first direction is larger than the length of the short side along the second direction.
11 . The detector micro-block of claim 10 , wherein a ratio of the length of the long side along the first direction and the length of the short side along the second direction is greater than 1 and less than 5.
12 . A detector block for emission computed tomography (ECT), comprising a plurality of detector micro-blocks of claim 10 arranged in a block array.
13 . The detector block of claim 12 , wherein the short sides of the crystal elements in the plurality of detector micro-blocks are parallel to each other.
14 . The detector block of claim 12 , wherein the short sides of the crystal elements in one or more first detector micro-blocks of the plurality of detector micro-blocks are perpendicular to the short sides of the crystal elements in one or more second detector micro-blocks of the plurality of detector micro-blocks.
15 . The detector block of claim 14 , wherein each pair of adjacent detector micro-blocks in the plurality of detector micro-blocks include one first detector micro-block and one second detector micro-block to form a checkerboard structure.
16 . The detector block of claim 15 , wherein the detector block includes first sub-blocks and second sub-blocks, each of the first sub-blocks and the second sub-blocks includes multiple detector micro-blocks, the detector micro-blocks of each first sub-block have a first arrangement manner, the detector micro-blocks of each second sub-block have a second arrangement manner different from the first arrangement manner.
17 . A method for identifying positions of photon gamma interactions, implemented on a computing machine having one or more processors and one or more storage devices, the method comprising:
obtaining output information of the optical sensors of the detector micro-block according to claim 1 ; and
determining, based on the output information of the optical sensors, position information of a photon gamma interaction that occurs in the crystal elements of the detector micro-block according to claim 1 .
18 . A method for emission computed tomography (ECT), implemented on a computing machine having one or more processors and one or more storage devices, the method comprising:
obtaining output information of the optical sensors of the plurality of detector micro-blocks of the detector block according to claim 14 ;
dividing the output information into a first subset and a second subset, the first subset corresponding to the optical sensors of the one or more first detector micro-blocks, the second subset corresponding to the optical sensors of the one or more second detector micro-blocks;
generating a first ECT image based on the first subset; and
generating a second ECT image based on the second subset.
19 . The method of claim 18 , wherein a first image resolution of the first ECT image along the first direction is greater than a second image resolution of the second ECT image along the first direction, and the first image resolution of the first ECT image along the second direction is less than the second image resolution of the second ECT image along the second direction.
20 . The method of claim 18 , further comprising:
generating a third ECT image based on the first subset and the second subset.