PET stands for Positron Emission Tomography.

PET表示正电子放射断层造影术。

It was a very difficult first step to accept the positron.

接受正电子是艰难的第一步。

The result is that the electron shadow and the positron shadow are separated.

结果将使得电子的阴影和正电子的阴影被分开。

The vacancy defects of samples were measured by slow positron annihilation.

借助慢正电子湮没技术研究了样品的空位型缺陷。

Positron emission tomography (PET) is an emerging modality in lung cancer staging.

正电子放射断层造影术(PET)是新兴的适用于肺癌分期的检查方法。

The new collider has to provide exact measurements of electron-positron annihilation.

新型的对撞机必须提供电子-正电子湮灭的准确测量结果。

After an immeasurably short time interval, the electron - positron pair recombine .

电子― 正电子偶经过一个不可测量的短暂时间间隔后就重新复合。

Later, electron and positron pairs were actually produced in laboratory experiments.

之后，电子与正电子对也最终在实验室中被制造出来。

The fraction is dependent on the target material, temperature and incident positron energy.

转换率依赖于靶材料、靶温度和入射慢正电子能量。

We investigate physicss properties of positronium and the way of positron - electron annihilation.

探讨正电子偶素的物理性质以及正电子—电子对的湮灭方式。

Objective To evaluate the value of high energy positron imaging in the diagnosis of colon neoplasm.

目的评估高能正电子成像技术在结肠肿瘤诊断中的临床实用价值。

The antihydrogen atoms are composed of a positron (an antimatter electron) orbiting an antiproton nucleus.

反氢原子是正电子(所谓正电子就是反物质的电子)围绕着以反质子为核心，作轨道运行所形成。

Beijing Electron Positron Collider (BEPC) is the State Key lab of our country in high physics research.

北京正负电子对撞机(BEPC)是用于高能物理研究的国家重点实验室。

Positron or electron-atom collision theory is a main and fundamental area of atomic and molecular physics.

正（负）电子与原子的碰撞理论是原子与分子物理主要的研究领域。

Both rely on mathematical calculations to determine the location from which a positron or phot on was emitted.

这两种成像方法均依靠精确的计算来决定正电子或光于发射的位置。

Blackett was really the first to obtain hard evidence for the existence of a positron but he was afraid to publish it.

布莱克特几乎是第一个发现正电子存在的有力证据的人，但他却没敢发表这个结果。

Positron and electron (particle and anti-particle) can annihilate in collision turning into electromagnetic radiation.

正电子和电子(粒子和反粒子)在对撞中会发生湮灭，并产生电磁辐射。

Positron emission tomography study of regional cerebral metabolism during general anesthesia with xenon in humans.

氙气全身麻醉时对于人类局部区域脑代谢的正电子扫描图像研究。

Objective:To discuss the nursing countermeasure for receiving high quality Positron Emission Tomography (PET) image.

目的：探讨正电子发射计算机断层显像检查中的护理方法。

Optical absorption spectra and positron annihilation radiation Doppler broadening were measured at room temperature.

在室温条件下测量了吸收光谱与正电子湮没辐射多普勒展宽谱。

Some of these gamma rays pass near atomic nuclei, in the process transforming into an electron and a positron, researchers said.

某些伽马射线在靠近原子核的附近经过，进入到转化为个电子和正电子的过程，研究人员说。

From earlier results using much less data, the positron cloud seemed to be spherical and centred on the centre of the galaxy.

从使用较少数据的早期结果来看，正电子云似乎是呈球状位于银河中心。

PET, or positron emission tomography, is an imaging study that allows doctors to evaluate the use of certain substances by the brain.

即正电子放射断层摄影术，是一项成像研究，它能使医生评价大脑对某些物质的使用。

The AEBB-2000 accelerator is a unique facility for carrying out experiments with anti-parallel electron-positron beams of high energies.

AEBB - 2000加速器是一部特殊的设备，它能实现高能量的反平行电子-正电子束试验。

It was left to Anderson to first publish the evidence for the existence of a positron and to scoop the credit for the discovery of the positron.

而第一个发表正电子存在的证据并被冠以正电子发现人这一称号的的人则变成了安德森。

These techniques include magnetic resonance imaging (MRI), positron emission tomography (PET), and functional magnetic resonance imaging (fMRI).

这些技术包括磁共振成像(MRI)，正电子成象术(PET)机能性磁共振成像(fMRI)。

To the electron, the corresponding system is the positron, which was observed after the prediction in cosmic ray experiments by Anderson in 1932.

对电子来说，与其相对应的是正电子，后者被安德森于1932年在宇宙射线实验中发现。

These experimental results give the corresponding positron experiment data for the application of cuprate superconductors and study of the mechanism.

该研究结果为铜氧化物超导体的应用和机理研究提供了相应的正电子实验资料。

And although Asimov's "positronic" brains do not exist, positrons are indeed used to probe human brains in positron-emission tomography (PET) scanning.

虽然阿西莫夫虚构的“正电子”大脑并不存在，但是正电子理论确确实实被应用于正电子衍射成像(PET)扫描技术上用来探索人类大脑。