The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Digitizing scintillation pulses with the Multi-voltage threshold (MVT) method shows great potentials for building all-digital positron emission tomography (PET). In this paper, we introduce the MVT method into gamma-ray spectroscopy. An accurate scintillation pulse model used in pulse fitting is especially important to get precise energy when implementing the MVT in gamma-ray spectroscopy, since a...
PET imaging is based on the detection in coincidence of two back-to-back annihilation photons. Implementation of coincidence detection in PET data acquisition systems usually involve energy discrimination and time discrimination. Depending on which is performed at first, the coincidence detection can be divided into two ways: energy discrimination before time discrimination (ETD) and time discrimination...
Traditional energy determination methods with shaper circuits are not suitable for high count rates applications, for which the analog-to-digital converters (ADC) with very high sampling rate are often used to digitize the pulse signal directly. The high sampling rate ADC brings the problems of high power consumption, high data bandwidth, and less stability and so on. In this paper, an all-digital...
In positron emission tomography (PET) applications, coincidence timing resolution is crucial for rejecting random events, while the extremely high timing resolution can be used for time-of-flight (TOF) reconstruction. The timing resolution of PET system is determined by many factors, including the scintillator crystal, the photomultiplier (PMT) and the data acquisition system. Many efforts have been...
Implementation of coincidence detection in PET systems usually involve energy discrimination and time discrimination. Depending on which is performed at first, the coincidence detection can be divided into two ways: energy discrimination before time discrimination (ETD) and time discrimination before energy discrimination (TED). The major difference of them is that, certain doubles from multiples...
An all-digital positron emission tomography (PET) scanner for imaging small animals has been developed at Huazhong University of Science and Technology (HUST). The implementation of block detector with position sensitive photomultiplier (PSPMT) and multi-voltage threshold (MVT) technology is presented in this paper. The detector comprises 12 basic detector modules (BDMs), which can be used to construct...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.