时间:2018-12-16 作者:英语课 分类:VOA标准英语2016年(六月)


英语课

Looking Into Your Brain Just Became Easier


Researchers and engineers keep improving the machines that help doctors better understand and diagnose conditions that affect our brains. One of the goals is to find causes of Alzheimer’s and Parkinson’s disease, which affect millions of people throughout the world.


Since the 1980s, doctors have used Magnetic Resonance 1 Imaging machines, or MRI scanners, to look into patients’ bodies without exposing them to the harmful effects of X-rays.


An alternating magnetic field created inside the MRI's tube excites hydrogen atoms in the body’s tissues, making them emit radio waves. Those waves can be turned into pictures, similar to X-ray images.


The magnet of a new MRI, built by Siemens, has 7 tesla units, making it more than 100,000 (7/0.000065 = 107,692) times more powerful than the earth’s magnetic field.


“Using something like 7-tesla imaging, you can do very high resolution imaging, you can get the contrast that you need in order to identify the particular sub-parts of the nuclei 2 that you need,” said Peter Jezzard, a professor of neuroimaging.


But even high-resolution two-dimensional black-and-white pictures are quite different from three-dimensional color renditions that can be viewed from all angles.


Using MRI-generated images of water molecules 3 moving within the brain’s white matter, scientists at the British company Holoxica created a hologram showing the connections between neurons.


“The brain is such a complex three-dimensional structure, and sometimes it is quite difficult to describe, or understand, the actual connections," said neurosurgeon Basil Ridha. "So to see it in 3-D, that may be a short cut to education, and it can reinforce the learning process.”


The holographic display is still in prototype phase, but researchers say, once ready for production, it will be compatible not only with MRI machines but also with CT and ultrasound scanners.



1 resonance
n.洪亮;共鸣;共振
  • Playing the piano sets up resonance in those glass ornaments.一弹钢琴那些玻璃饰物就会产生共振。
  • The areas under the two resonance envelopes are unequal.两个共振峰下面的面积是不相等的。
2 nuclei
n.核
  • To free electrons, something has to make them whirl fast enough to break away from their nuclei. 为了释放电子,必须使电子高速旋转而足以摆脱原子核的束缚。
  • Energy is released by the fission of atomic nuclei. 能量是由原子核分裂释放出来的。
3 molecules
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
学英语单词
abhorring
acquired cleftpalate
advertence
aggrege
approximate true elongation percentage
aural detector
auto cutter
Berilo
bootlegs
bresnahan
capitalised value
chromises
clobedolum
cold atmospheric leaching
conjugata
conservativeness
container freight station to door
contextual protection
contract for carriage
copperas
cost-per-action
Crocethia
cryptanthus zonatus
cylindrical auger
Cymothoidae
deglutition centre
dilute phase roasting
disapprovest
discors
divergence
duking
echo-signal
electric resistance thermometer
endotransglycosylases
flash-over relay
garment container
hawksworth
hierarchical interrupt
hill-and-dale
Horheim
host unreachable
Indochinese, Indo-Chinese
inertially balanced stabilized platform
interchange circuits
kot
kuessel
Le Massegros
letter bundling machine
memory attribute list
micrometeoritic
MO-MLV
moroccoes
Mututu
naphthalic aicd
national grid compang
numbered unit
pain phosphorus
pallidotomies
parental rights and duties
partes subcutanea
payload deployment and retrieval system
petunia
platanthera chloranthas
platypelloid
porfiry
propagules
quenching crack
remi inferior ossis ischii
repair truck
Rhododendron aganniphum
rickson
scandium oxalate
sense of worth
servo surface encoding
set priorities
sidles
specification of quality
state guarantee
stony iron-meteorite
sulfuric acid monohydrate
sweet meat
tar-pot
ternity
transmitter distortion
trust fund bureau
two sample t-test
U Thant
unassailableness
undefined length record
under water concrete
valeriane
ventresca
vernier theodolite
Von Hippel-Lindau disease
way to go
weaponizing
weigelias
weightiest
wrast
yanagisawa
yowlings
zero check