Forschungszentrum Juelich Gmbh

Koninklijke Philips Corporation N.v.

Forschungszentrum Julich Gmbh

Christoph Lerche

Nadim Joni Shah

Arne Berneking

Volkmar Schulz

Torsten Solf

Bjoern Weissler

Suk Min Hong

Joerg Felder

Sarah Lodomez

Poornima Sampath

Wenwei Bi

Chang-Hoon Choi

Joni Nadim Shah

Jörg Felder

A dipole antenna array includes at least two dipole antenna elements. Each respective dipole antenna element has at one end a fold which consists of a bend, a bent region, and the projection of the bent region of the dipole antenna element onto a length of the dipole antenna element. Each respective dipole antenna element at least partially encloses a cavity.

Dipole antenna array for hybrid MR-PET and MR-SPECT scans and use thereof, and MR-PET or MR-SPECT tomograph with a dipole antenna array

A method for determining position and energy in scintillation detectors includes determining a photoconversion energy and a photoconversion position of particles triggering scintillation events, in an iteration-free manner, calculated from a distribution of scintillation light released by one or more of the scintillation events. The distribution of scintillation light is scanned by a photodetector.

Method for the position and energy determination in scintillation detectors

An SiPM sensor chip includes pixels consisting of microcells Z, each pixel being associated with an xy position x1, x2, x3, . . . , xN or y1, y2, y3, . . . yM. A plurality of pixels form a block, and the microcells are connected to output channels for a linear coding.

Sensor chip

A SiPM sensor chip with a plurality of pixels includes a photodiode; a quench resistor; and a current divider configured to divide the photocurrent of the photodiodes into two currents of equal size. The current divider Sq,nm or Snm lead to networks NS,h,n and NS,V,m, each of which leads to additional current dividers Sh,n and Sv m having coding resistors Rh,A,n and Rh,B,n, and Rv,c,m and Rv D m, which are linearly coded and which lead to output channels A, B, C, D, with these sensor features being integrated into the sensor chip. The networks Ns,h,n and/or NSiVlm each lead to a summation network Oh and/or Ov, in which the signals of the networks Ns,h,n and/or NS,v,m are merged via summation resistors Rs,h,n and Rs,v,m, respectively, and lead to the output channels E and/or F.

SIPM sensor chip

A method for photosensor signal processing includes carrying out, by measuring a combination of readout channels of a direction e with linearly increasing and linearly decreasing signal strength, a linear coding in at least one e-direction. The linearly increasing and linearly decreasing signal strengths of readout channels of the direction e, which are respectively used for the linear coding, are multiplied by each other. The linear coding satisfies the following edge condition: Q(e)=c&#xb7;e+c, Q(e)=c&#xb7;e+c, c=const. &#x2208;(0, &#x221e;), c=const. &#x2208;(&#x2212;&#x221e;, 0), c, c=const. &#x2208;(&#x2212;&#x221e;, &#x221e;), and 0.5&#x3c;c; c&#x3c;1.5. Q1 denotes the charge of the output channel signal strengths increasing via the e-position, and Q2 denotes the charge of the output channel signal strengths decreasing via the e-position and the coding direction.

Method for the signal processing of a photosensor

The invention concerns an evaluation apparatus () for evaluating gamma radiation events detected by a gamma camera () and identifying valid gamma radiation events, said (gamma camera () including a scintillator () for emitting scintillation photons () at photo conversion positions () in the scintillator () in response to incident gamma rays () and resulting gamma radiation events and a position-sensitive photodetector() for detecting emitted scintillation photons () and obtaining therefrom a spatial signal distribution (). The invention further concerns a calibration apparatus () for in-situ calibrating a position-sensitive photodetector () of a gamma camera () for the detection of gamma radiation events.

Apparatus and method for the evaluation of gamma radiation events

Spatial intensity distributions of scintillation photons emitted by the scintillator array () in response to multiple incident gamma rays in record are recorded (S). Sets of coincidently emitted scintillation photons from the recorded spatial intensity distributions are determined (S). The sets of coincidently emitted scintillation photons center-of-gravity positions (S) and cumulative energies are determined (S). A clustering analysis based on the determined center-of-gravity positions and cumulative energies to obtain clusters () of gamma ray events attributed to a scintillator array element is performed (). A cluster () of the spatial intensity distributions is cumulated (S) to determine a cumulative spatial intensity distribution of scintillation photons emitted in response to incident gamma rays in the scintillator array element. A light matrix including expected spatial intensity distributions of scintillation photons for different scintillator array elements () is determined (S) based on the cumulative spatial intensity distributions.

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Herzogenrath, Germany

Christoph Lerche