11C-Methionine Kinetics in Pregnant Rhesus Monkeys Studied by Positron Emission Tomography: A New Approach to Feto-Maternal Metabolism

1984 ◽  
Vol 63 (7) ◽  
pp. 641-645 ◽  
Author(s):  
Lars Berglund ◽  
Christer Halldin ◽  
Anders Lilja ◽  
Bo S. Lindberg ◽  
Hans Låndqvist ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Rhesus Monkeys ◽  
Emission Tomography ◽  
New Approach ◽  
Positron Emission ◽  
Maternal Metabolism

In Vivo Ester Hydrolysis as a New Approach in Development of Positron Emission Tomography Tracers for Imaging Hypoxia

2019 ◽  
Vol 16 (3) ◽  
pp. 1156-1166 ◽  
Author(s):  
Lifang Zhang ◽  
Xinyue Yao ◽  
Jianhua Cao ◽  
Haiyan Hong ◽  
Aili Zhang ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Ester Hydrolysis ◽  
Emission Tomography ◽  
New Approach ◽  
Positron Emission

A New Approach to Image Reconstruction in Positron Emission Tomography Using Artificial Neural Networks

1998 ◽  
Vol 09 (01) ◽  
pp. 71-85 ◽  
Author(s):  
A. Bevilacqua ◽  
D. Bollini ◽  
R. Campanini ◽  
N. Lanconelli ◽  
M. Galli
Keyword(s):  
Positron Emission Tomography ◽  
Simulated Data ◽  
Emission Tomography ◽  
Source Distribution ◽  
New Approach ◽  
High Data ◽  
Positron Emission ◽  
Physical Effects ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

This study investigates the possibility of using an Artificial Neural Network (ANN) for reconstructing Positron Emission Tomography (PET) images. The network is trained with simulated data which include physical effects such as attenuation and scattering. Once the training ends, the weights of the network are held constant. The network is able to reconstruct every type of source distribution contained inside the area mapped during the learning. The reconstruction of a simulated brain phantom in a noiseless case shows an improvement if compared with Filtered Back-Projection reconstruction (FBP). In noisy cases there is still an improvement, even if we do not compensate for noise fluctuations. These results show that it is possible to reconstruct PET images using ANNs. Initially we used a Dec Alpha; then, due to the high data parallelism of this reconstruction problem, we ported the learning on a Quadrics (SIMD) machine, suited for the realization of a small medical dedicated system. These results encourage us to continue in further studies that will make possible reconstruction of images of bigger dimension than those used in the present work (32 × 32 pixels).

Positron Emission Tomography Analysis of the Analgesic Effects of Acupuncture in Rhesus Monkeys

2006 ◽  
Vol 34 (05) ◽  
pp. 787-801 ◽  
Author(s):  
Toshihiro Maenaka ◽  
Kaori Tano ◽  
Satoshi Nakanishi ◽  
Hideo Tsukada ◽  
Torao Ishida
Keyword(s):  
Positron Emission Tomography ◽  
Rhesus Monkeys ◽  
Hot Water ◽  
Emission Tomography ◽  
Acupuncture Analgesia ◽  
Neuronal Activation ◽  
Brain Areas ◽  
Positron Emission ◽  
The Right ◽  
The Brain

The purpose of this study was to examine whether pain-induced brain activation was suppressed by acupuncture analgesia. We investigated the suppression of the pain-induced neuronal activation in specific brain areas of three male rhesus monkeys (aged four years old) using positron emission tomography (PET), in which changes in the regional cerebral blood flow (rCBF) were examined as an index of the neuronal activation. The brain areas such as the thalamus, insula and anterior cingulate cortex were activated by heating the tail of monkeys in 47°C water compared to the heating at 37°C. Those activations were suppressed by electroacupuncture (EA) with a 2 sec alteration of the frequency of 4 Hz/60 Hz at the right ST36 (the upper anterior tibial muscle) and the right LI4 (the back palm between the first and second metacarpal) acupoints. Meanwhile, this EA analgesic effect was confirmed by prolonging the tail withdrawal latencies from hot water in the temperature range from 45 to 50°C.These brain areas were corresponded to the pain-related areas as reported in previous studies. In conclusion, we were able to visualize the acupuncture analgesia in the CNS. We also detected the brain areas activated or inactivated by acupuncture. The areas that responded to acupuncture stimulation at 47°C water were different from the regions at 37°C. We consider that this difference in the response to acupuncture may support the variation of the clinical efficacy of acupuncture in patients bearing pain or other disorders.

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