Pulse processing for the PET liquid xenon multiwire ionisation chamber

Nuclear Instruments and Methods in Physics Research Section A:

Pereira

et al. 2002

Self Cite

A two-dimensional readout with metal strips deposited on both sides of a glass plate is investigated aiming to assess the possibility of its use in a liquid xenon ionisation chamber for positron emission tomography. Here, we present results obtained with an a-source. It is shown that position resolution of p1 mm, fwhm, can be achieved for free charge depositions equivalent to those due to g-rays with energy from 220 down to 110 keV. r

“…The data acquisition system was similar to that described in Ref. [5]. Flash ADCs [10] were employed in some measurements to study the signal shape.…”

Section: Methodsmentioning

confidence: 99%

“…A prototype chamber containing about 300 cm 3 of liquid has been built and studied [3][4][5][6][7]. The present design of the chamber is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional readout in a liquid xenon ionisation chamber

Solovov

Nuclear Instruments and Methods in Physics Research Section A:

Pereira

et al. 2002

Self Cite

“…Since the standard solution for this problem (Frish grid) is difficult to implement due to limited space and inevitable increase of dead space in the detector (and, consequently, its efficiency), we used an alternative approach, which consists in the correction of the measured pulse amplitude using the information obtained from the rise time. From simulation, a correlation function between the pulse amplitude and (x, y)-position of the interaction point was found and the correction was applied to every detected signal [14]. The results are shown in Fig.4, in which one can see the amplitude spectrum due to 511 keV γ-rays as it is measured, the charge-time correlation plot and the corrected spectra.…”

Section: Use Of Chargementioning

confidence: 99%

“…The lower trace in Fig.3,a corresponds to the channel (a pair of wires), in which the charge was collected, while the upper shows the signal read out the adjacent channel. The collecting channel is identified by reading the signal amplitude 3 µs after the trigger [14] thus allowing the measurement of z-position corresponding, in terms of PET, to the depth-of-interaction. Due to the low mobility of positive ions in the liquid only the electronic component of the signal can be observed with suitable integration time constants.…”

Section: Use Of Chargementioning

confidence: 99%

Development of Liquid Xenon Detectors for Medical Imaging

Technique and Application of Xenon Detectors

Lopes

Solovov

et al. 2003

Self Cite

“…Table 4 summarizes the results of assessment of the liquid xenon module in comparison with two state-of-the-art scintillation detectors. More details on the detector and its performance are given in Chepel et al (1999), Crespo et al (2000) and Lopes et al (2001).…”

Section: Article In Pressmentioning

confidence: 99%

Detectors for medical radioisotope imaging: demands and perspectives

Lopes

Radiation Physics and Chemistry

2004

Self Cite

Radioisotope imaging is used to obtain information on biochemical processes in living organisms, being a tool of increasing importance for medical diagnosis. The improvement and expansion of these techniques depend on the progress attained in several areas, such as radionuclide production, radiopharmaceuticals, radiation detectors and image reconstruction algorithms. This review paper will be concerned only with the detector technology.We will review in general terms the present status of medical radioisotope imaging instrumentation with the emphasis put on the developments of high-resolution gamma cameras and PET detector systems for scinti-mammography and animal imaging. The present trend to combine two or more modalities in a single machine in order to obtain complementary information will also be considered. r