Company
Product List
Offer to buy
Offer to sell
Sign In
Join
Help
Languages
English
繁體中文
簡體中文
TopscomTechnologyCo.,Ltd.
Home
Company Profile
Products
Video
Inquiry
Contact Us
Recommended Results
ultrasound imaging systems electronic assembly
Category :
Shoes and leather->Shoes->other brands shoes
View Larger Picture
View Larger Picture
View Larger Picture
Product Specification
Model No:
ultrasound imaging systems pcb assembly
Country
CN
Payment Term
T/T
Product Detail
<p>
Instrumentation medical devices ultrasound imaging systems
pcba assembly electronics oem contract manufacturing services OEM CEM EMS experience
company-China Shenzhen Topscom
</p>
<br />
<img src="http://i.bosscdn.com/product/76/b1/d1/789c4c7b9087772dfde7784692.jpg@watermark=2&color=I0ZGRkZGRg%3D%3D&type=ZHJvaWRzYW5zZmFsbGJhY2s%3D&size=17&p=9&t=80&text=cGNiYXNzZW1ibHljaGluYS5ib3NzZ29vLmNvbQ%3D%3D" title="smt workshopnew" alt="smt workshopnew" /><br />
<br />
<p>
medical ultrsound imagine diagnostic <span>Electronic OEM EMS CEM Contract Manufacturing PCb assembly service</span>
</p>
<p class="MsoNormal">
<span>Medical ultrasound (also known as
diagnostic sonography or ultrasonography) is a diagnostic imaging technique
based on the application of ultrasound. It is used to see internal body
structures such as tendons, muscles, joints, vessels and internal organs. Its
aim is often to find a source of a disease or to exclude any pathology. The
practice of examining pregnant women using ultrasound is called obstetric
ultrasound, and is widely used.</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>Ultrasound is sound waves with frequencies
which are higher than those audible to humans (>20,000 Hz). Ultrasonic
images also known as sonograms are made by sending pulses of ultrasound into
tissue using a probe. The sound echoes off the tissue; with different tissues
reflecting varying degrees of sound. These echoes are recorded and displayed as
an image to the operator.</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>Many different types of images can be
formed using sonographic instruments. The most well-known type is a B-mode
image, which displays the acoustic impedance of a two-dimensional cross-section
of tissue. Other types of image can display blood flow, motion of tissue over
time, the location of blood, the presence of specific molecules, the stiffness
of tissue, or the anatomy of a three-dimensional region.</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>Compared to other prominent methods of
medical imaging, ultrasound has several advantages. It provides images in
real-time, it is portable and can be brought to the bedside, it is
substantially lower in cost, and it does not use harmful ionizing radiation.
Drawbacks of ultrasonography include various limits on its field of view
including patient cooperation and physique, difficulty imaging structures
behind bone and air, and its dependence on a skilled operator.</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>Doppler ultrasonography</span>
</p>
<p class="MsoNormal">
<span>Spectral Doppler scan of the common carotid
artery</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>Colour Doppler scan of the common carotid
artery</span>
</p>
<p class="MsoNormal">
<span>Sonography can be enhanced with Doppler
measurements, which employ the Doppler effect to assess whether structures
(usually blood)[16] are moving towards or away from the probe, and its relative
velocity. By calculating the frequency shift of a particular sample volume, for
example flow in an artery or a jet of blood flow over a heart valve, its speed
and direction can be determined and visualised. This is particularly useful in
cardiovascular studies (sonography of the vascular system and heart) and
essential in many areas such as determining reverse blood flow in the liver
vasculature in portal hypertension. The Doppler information is displayed
graphically using spectral Doppler, or as an image using color Doppler
(directional Doppler) or power Doppler (non directional Doppler). This Doppler
shift falls in the audible range and is often presented audibly using stereo
speakers: this produces a very distinctive, although synthetic, pulsating
sound.</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>All modern ultrasound scanners use pulsed
Doppler to measure velocity. Pulsed wave machines transmit and receive series
of pulses. The frequency shift of each pulse is ignored, however the relative
phase changes of the pulses are used to obtain the frequency shift (since
frequency is the rate of change of phase). The major advantages of pulsed
Doppler over continuous wave is that distance information is obtained (the time
between the transmitted and received pulses can be converted into a distance
with knowledge of the speed of sound) and gain correction is applied. The
disadvantage of pulsed Doppler is that the measurements can suffer from
aliasing. The terminology "Doppler ultrasound" or "Doppler
sonography", has been accepted to apply to both pulsed and continuous Doppler
systems despite the different mechanisms by which the velocity is measured.</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>It should be noted here that there are no
standards for the display of color Doppler. Some laboratories show arteries as
red and veins as blue, as medical illustrators usually show them, even though
some vessels may have portions flowing towards and portions flowing away from
the transducer. This results in the illogical appearance of a vessel being
partly a vein and partly an artery. Other laboratories use red to indicate flow
toward the transducer and blue away from the transducer. Still other
laboratories prefer to display the sonographic Doppler color map more in accord
with the prior published physics with the red shift representing longer waves
of echoes (scattered) from blood flowing away from the transducer; and with
blue representing the shorter waves of echoes reflecting from blood flowing
toward the transducer. Because of this confusion and lack of standards in the
various laboratories, the sonographer must understand the underlying acoustic
physics of color Doppler and the physiology of normal and abnormal blood flow
in the human body (see Red shift</span>
</p>
<p class="MsoNormal">
<span> </span>
</p>
<p class="MsoNormal">
<span>Although Angiography and Venography which
both use X-ray and contrast injection material are more accurate than Doppler
Sonography, Doppler Sonography may be chosen because it is faster, less
expensive, and non-invasive.</span>
</p>
<p>
<br />
</p>
<br />pcbassemblycn.com
More Products from this Supplier
urological therapy systems electronic assembly
multilayer electronic pcb boards manufacturing
aerospace RF amplifier antenna pcb assembly
Electronic Contract OEM Manufacturing assembly
[ Back Products Catalog ]
Commerce Member:
Please log in your ID and password, we will later fill in relating info.
ID:
Password:
Remember my ID on this computer
Complete this form below to send out your enquiries.
All enquiries will be automatically sent to the company you want to develop.
Subject
Content
(Don't input Company Name, E-Mail, Phone Number, Fax Number, and URL)
Company Profile:
*
Company Name
*
E-mail
*
Country
Please Select Your Country
United States
Afghanistan
Albania
Algeria
American Samoa
Andorra
Angola
Anguilla
Antarctica
Antigua and Barbuda
Argentina
Armenia
Aruba
Australia
Austria
Azerbaidjan
Bahamas
Bahrain
Bangladesh
Barbados
Belarus
Belgium
Belize
Benin
Bermuda
Bhutan
Bolivia
Bosnia Herzegovina
Botswana
Bouvet Island
Brazil
British Indian Ocean Territory
Brunei Darussalam
Bulgaria
Burkina Faso
Burundi
Cambodia
Cameroon
Canada
Cape Verde
Cayman Islands
Central African Republic
Chad
Chile
China
Christmas Island
Cocos (Keeling) Islands
Colombia
Comoros
Congo
Cook Islands
Costa Rica
Croatia
Cuba
Cyprus
Czech Republic
Denmark
Djibouti
Dominica
Dominican Republic
East Timor
Ecuador
Egypt
El Salvador
Equatorial Guinea
Eritrea
Estonia
Ethiopia
Falkland Islands
Faroe Islands
Fiji
Finland
Former Czechoslovakia
Former USSR
France
France (European Territory)
French Guyana
French Southern Territories
Gabon
Gambia
Georgia
Germany
Ghana
Gibraltar
Great Britain
Greece
Greenland
Grenada
Guadeloupe (French)
Guam (USA)
Guatemala
Guinea
Guinea Bissau
Guyana
Haiti
Heard and McDonald Islands
Honduras
Hong Kong
Hungary
Iceland
India
Indonesia
Iran
Iraq
Ireland
Israel
Italy
Ivory Coast
Jamaica
Japan
Jordan
Kazakhstan
Kenya
Kiribati
Kuwait
Kyrgyzstan
Laos
Latvia
Lebanon
Lesotho
Liberia
Libya
Liechtenstein
Lithuania
Luxembourg
Macau
Macedonia
Madagascar
Malawi
Malaysia
Maldives
Mali
Malta
Marshall Islands
Martinique (French)
Mauritania
Mauritius
Mayotte
Mexico
Micronesia
Moldavia
Monaco
Mongolia
Montserrat
Morocco
Mozambique
Myanmar
Namibia
Nauru
Nepal
Netherlands
Netherlands Antilles
Neutral Zone
New Caledonia (French)
New Zealand
Nicaragua
Niger
Nigeria
Niue
Norfolk Island
North Korea
Northern Mariana Islands
Norway
Oman
Pakistan
Palau
Panama
Papua New Guinea
Paraguay
Peru
Philippines
Pitcairn Island
Poland
Polynesia (French)
Portugal
Puerto Rico
Qatar
Reunion (French)
Romania
Russian Federation
Rwanda
S. Georgia & S. Sandwich Isls.
Saint Helena
Saint Kitts & Nevis Anguilla
Saint Lucia
Saint Pierre and Miquelon
Saint Tome (Sao Tome) and Principe
Saint Vincent & Grenadines
Samoa
San Marino
Saudi Arabia
Senegal
Seychelles
Sierra Leone
Singapore
Slovak Republic
Slovenia
Solomon Islands
Somalia
South Africa
South Korea
Spain
Sri Lanka
Sudan
Suriname
Svalbard and Jan Mayen Islands
Swaziland
Sweden
Switzerland
Syria
Tajikistan
Taiwan
Tanzania
Thailand
Togo
Tokelau
Tonga
Trinidad and Tobago
Tunisia
Turkey
Turkmenistan
Turks and Caicos Islands
Tuvalu
Uganda
Ukraine
United Arab Emirates
United Kingdom
Uruguay
Uzbekistan
Vanuatu
Vatican City State
Venezuela
Vietnam
Virgin Islands (British)
Virgin Islands (USA)
Wallis and Futuna Islands
Western Sahara
Yemen
Yugoslavia
Zaire
Zambia
Zimbabwe
*
Contact Person
URL
*
Phone
-
-
Fax
-
-
*
Postal code
*
City
*
Street Address
*
Business Nature
Distributor
Exporter
Importer
Manufacturer
Whole Sale
Retailer
Reseller
Retrofitter
User
Others, please specify:
*
Security Code
Enter the security code.
Site Map l
Privacy Policy l
Company Profile l
Corporate Proposal l
Contact Us l
Help l
Advertise With Us l
World Trade Link
.