NMRC12 series is a NMR-based nano-pore analyzer used to study the pore structure and distribution of porous materials. The determination of pore distribution can be measured and calculated by applying the relationship between the pore size and the freezing point of pore fluid. This NMR technique could be used to monitor the phase transition in pore fluid in real time and the detection range of pore size falls in 2 to 500 nm if appropriate fluid samples are chosen.
Temperature range: – 30 0C~ 40 0C/ – 50 0C~ 40 0C (accuracy: ± 0.01 0C);
Cooling rate：10C / min;
Sample volume: 0.5 cm3 ~ 1 cm3;
Pore size: 2 nm ~ 500 nm.
Static fluid in pores improves the accuracy and resolution during the measuring course of cryogenic NMR method;
The modular gas supply system provides a stable and dry air flow as the media, which reduces signal minimum and can work for a long period of time;
Ultra-low temperature thermostat system at – 60 0C gurantees a stable cooling source which can cool down the air flow quickly and stablize it;
Two-stage heating resistors heat the sample chamber rapidly and control the temperature precisely;
NMR analyzer system with mature technology and full NMR capabilities: stable magnetic field, short dead time, and high SNR;
Probe designed for low temperature isolates the heat exchanges between sample chamber and the magnet effectively;
The powerful software with friendly user interface offers a fully automated solution including calculation, temperature setting, sampling, and data process plus figure exporting.
The EDUMR virtual data acquisition and image reconstruction teaching software is a low-field magnetic resonance analyzing and imaging simulation system combining NMR and MRI system all in one. By using this virtual NMR analyzer signal acquisition and image processing software, we can easily build up a teaching platform, and the realistic teaching of NMR principles and techniques become much more achievable. The virtual magnetic resonance imaging system can simulate the entire process. With the parameter driven interface users can select imaging sequence, the original level and imaging technology, carry out the relevant data collection process and perform K space filling of reconstructed images. The use of virtual systems allows many students to learn simultaneously without the need to invest in expensive hardware or several supervisors to train users.
Perform virtual sequence selection, parameter adjustment, data acquisition, K space filling, image reconstruction function; The influence of magnetic field in homogeneity and electronic noise can be simulated; Minimal investment in hardware is an advantage; Perform fat suppression imaging; Perform water suppression imaging; Perform Bounce-point Imaging; Perform Half-Fourier scanning &Imaging; Overcomes the problem of long time of acquisition through inadequate instrumentation; More than four pulse sequences (SE sequence), FSE sequence, IR sequence, GRE sequence) can be used for virtual imaging data collection; Observe how the scan parameters affect the image; Minimize the impact of gradient eddy current, analog acquisition in severe T2-weighted images; Adjust the data acquisition to a normal speed and a very-fast speed.
Atlas of Small Animals MRI is a highly illustrated guide to the common clinical disorders of dogs and cats that are now routinely diagnosed using computed tomography and magnetic resonance imaging. This invaluable new resource features a wealth of high-quality CT and MRI images and includes relevant radiographic, ultrasonographic, endoscopic, and gross pathology images, offering a unique approach emphasizing comparative imaging and pathologic correlation.
The book is organized by anatomical region with subsections focusing on specific anatomical sites or disorders—from the head, neck, brain and spine to the thorax, abdomen, and musculoskeletal system. The accompanying text emphasizes important imaging features focusing on what is important to the diagnosis of disease. Where helpful to the imaging diagnosis, information related to disease etiopathology, non-imaging diagnostic procedures, and treatment is also included.
Essential for specialists in training and qualified specialists in the fields of small animal veterinary diagnostic imaging, internal medicine, and surgery. Also of interest to those in general veterinary practice who commonly refer patients for CT and MRI examinations.
Atlas of Small Animal CT & MRI is a highly illustrated diagnostic imaging guide to common clinical disorders of dogs and cats.
Contains over 3,000 high quality CT, MRI and related diagnostic images
Offers a unique approach emphasizing comparative imaging and pathologic correlation
Focuses on important imaging features relevant to imaging diagnosis of disease in dogs and cats
Written by internationally renowned experts in the field
Practical Small Animal MRI is the seminal reference for clinicians using Magnetic Resonance Imaging in the diagnosis and treatment of veterinary patients. Although MRI is used most frequently in the diagnosis of neurologic disorders, it also has significant application to other body systems. This book covers normal anatomy and specific clinical conditions of the nervous system, musculoskeletal system, abdomen, thorax, and head and neck. It also contains several chapters on disease of the brain and spine, including inflammatory, infectious, neoplastic, and vascular diseases, alongside congenital and degenerative disorders.
The two authors, a radiologist and a neurologist, supported by two other contributors, each have over 20 years’ experience in MRI, and this is borne out by the huge amount of information and images presented.
A fascinating insight into the field; the text is well-written and extremely detailed…. invaluable as an introduction to principles of the physics of MRI and the challenges of producing diagnostic images without artifacts, and as a reference for use in clinical situations.
The extensive experience of the authors combined with a comprehensive review of the literature published on small animals MRI imaging make this the most comprehensive text on this subject…. the image quality is excellent.
I purchased the book for my boyfriend as a gift. He’s an MRI tech/Vet tech for a veterinary neurology practice. He really enjoys the book and says that it is exactly what he needed. He thinks the content is well written and has helped him with MRI scanning. His only complaint is that in three months the book is falling apart. This isn’t a book that gets throw around or misused. Half of the neurology chapter has fallen out of the book along with some other pages. Considering the cost of the book this is very surprising. At this rate this book may not last a year. Not sure if it’s just his copy or if others have had the same experience. Unfortunately, because of this experience I can not recommend getting the hardcover version of this book.
Gadolinium MRI contrast agent is used in about 1 in 3 of MRI scans to improve the clarity of the images or pictures of your body’s internal structures. This improves the diagnostic accuracy of the MRI scan. For example, it improves the visibility of inflammation, tumours, blood vessels and, for some organs, blood supply.
Before the scan begins, the radiologist (specialist doctor supervising the scan) will decide, on the basis of the notes sent by your referring doctor, whether gadolinium injection is likely to be helpful and should be recommended for your MRI.
Before any MRI scan, you will be asked a number of questions about your medical history, and any implants you might have, to make sure that you will not be at risk from the strong magnetic fields of the scanner. You will also be asked about conditions that might mean a gadolinium injection would not be recommended (e.g. pregnancy, previous allergic reaction, severe kidney disease). If you have any of these conditions, then you will not be given gadolinium, but if there is no condition preventing injection, you might be asked to sign a consent form in case gadolinium is required.
Usually, you will be advised by the technologist or nurse before you have the MRI scan that it is recommended that gadolinium contrast medium be injected during the examination. As with any medical procedure, you have the right to seek further advice and/or to decline a gadolinium injection. The technologist who carries out the MRI scan, a nurse or a radiologist will give you the injection.
Sometimes, even though gadolinium initially would not have been required based on the referral notes provided by your doctor, the radiologist might decide during your scan that gadolinium would help make the images clearer. If you are told part of the way through your scan that gadolinium will be needed, you should not be concerned that this indicates something serious is wrong. Most often, this is being done to make the images clearer and of a higher quality, so the radiologist can provide your doctor with a more accurate diagnosis of your symptom or condition. If the gadolinium is not given after such a recommendation, another scan may be required later.
Time Domain Analyzer is useful for measuring impedance values along a transmission
line and for evaluating a device problem in time or distance. Time
domain display provides a more intuitive and direct look at the device under test characteristics. In addition, it gives more meaningful information concerning
the broadband response of a transmission system than other measuring techniques
by showing the effect of each discontinuity as a function of time or distance. This document
will focus on time domain analysis generated from vector
network analyzers. The intent is to provide engineers with frequency
domain background, an in-depth view of how a time domain display is created
from frequency domain data and how to apply the time domain
display to common problems in RF systems.
Agilent offers other documents that cover in detail the use of time domain displays. See
the bibliography for more details.
The measurement technique of time domain reflectometry was introduced in the
early 1960’s and works on the same principle as radar. A pulse of energy is transmitted
down a cable. When that pulse
reaches the end of the cable, or a fault along the cable, part or all of the pulse energy is
reflected back to the instrument. TDR measurements are made by launching an impulse
or a step into the test device and observing the response in time. Using a step generator
and a broadband oscilloscope, a fast edge is launched into the transmission line. The
incident and reflected voltage waves are monitored by the broadband oscilloscope at a
particular point on the line. By measuring the ratio of the input voltage to the reflected
voltage, the impedance of simple discontinuities can be calculated. The position of the
discontinuity can also be calculated as a function of time by applying the velocity of
propagation along the transmission line. The type of discontinuity can be identified by its response.
While the traditional TDR oscilloscope was useful as a qualitative tool, there were
limitations that affected its accuracy and usefulness; a) TDR output step rise time
– the spatial resolution of the measurement depends upon the step rise time; b) poor
signal-to-noise ratio due to the wideband receiver architecture.
Then, in the 70’s, it was shown that the relationship between the frequency domain and
the time domain could be described using the Fourier Transform. The Fourier Transform
of the network reflection coefficient as a function of frequency is the reflection coefficient
as a function of time; i.e., the distance along a transmission line. It was possible
to measure the response of a DUT in the frequency domain and then mathematically
calculate the inverse Fourier Transform of the data to give the time domain response.
A high performance VNA combined with fast computation power created unique measurement
capabilities. Using error-corrected data measured in the frequency domain, the
response of a network to step and impulse time stimuli can be calculated and displayed
as a function of time. This gives traditional time domain reflectometry capability in reflection
and transmission and adds measurement capability of band-limited networks. By
locating network elements in time and removing their effects from measured data, the
vector network analyzer makes more precise frequency domain measurements possible.
Figure 1 shows how both time domain and frequency domain displays
can be generated by either a time domain reflectometer oscilloscope or a vector
network analyzer. Data captured using either a TDR or VNA can be transformed
into both displays.