Magnetic resonance imaging (MRI), nuclear magnetic resonance imaging (NMRI), or magnetic resonance tomography (MRT) is a medical imaging technique used in radiology to visualize internal structures of the body in detail. MRI makes use of the property of nuclear magnetic resonance (NMR) to image nuclei of atoms inside the body. MRI can create more detailed images of the human body than are possible with X-rays. An MRI scanner is a device in which the patient lies within a large, powerful magnet where the magnetic field is used to align the magnetization of some atomic nuclei in the body, and radio frequency magnetic fields are applied to systematically alter the alignment of this magnetization.[1] This causes the nuclei to produce a rotating magnetic field detectable by the scanner—and this information is recorded to construct an image of the scanned area of the body.[2]:36 Magnetic field gradients cause nuclei at different locations to precess at different speeds, which allows spatial information to be recovered using Fourier analysis of the measured signal. By using gradients in different directions, 2D images or 3D volumes can be obtained in any arbitrary orientation.A new study has found hat Sugar makes it easy to detectcancer growth in MRI.
Certain type of sugars are absorbed by the cancer cells more than the healthy cells.
In MRI the area lights up.
If put into practice, this process could be completed in a local hospital rather than refereed to Specialty Hospitals.
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The new technique, called ‘glucose chemical exchange saturation transfer’ (glucoCEST), is based on the fact that tumours consume much more glucose (a type of sugar) than normal, healthy tissues in order to sustain their growth.
The researchers found that sensitising an MRI scanner to glucose uptake caused tumours to appear as bright images on MRI scans of mice.
Lead researcher Dr Simon Walker-Samuel, from the UCL Centre for Advanced Biomedical Imaging (CABI) said: “GlucoCEST uses radio waves to magnetically label glucose in the body. This can then be detected in tumours using conventional MRI techniques. The method uses an injection of normal sugar and could offer a cheap, safe alternative to existing methods for detecting tumours, which require the injection of radioactive material.”
Professor Mark Lythgoe, Director of CABI and a senior author on the study, said: “We can detect cancer using the same sugar content found in half a standard sized chocolate bar. Our research reveals a useful and cost-effective method for imaging cancers using MRI — a standard imaging technology available in many large hospitals.”
He continued: “In the future, patients could potentially be scanned in local hospitals, rather than being referred to specialist medical centres.”
The study is published in the journal Nature Medicine and trials are now underway to detect glucose in human cancers.
Simon Walker-Samuel, Rajiv Ramasawmy, Francisco Torrealdea, Marilena Rega, Vineeth Rajkumar, S Peter Johnson, Simon Richardson, Miguel Gonçalves, Harold G Parkes, Erik Årstad, David L Thomas, R Barbara Pedley, Mark F Lythgoe, Xavier Golay. In vivo imaging of glucose uptake and metabolism in tumors. Nature Medicine, 2013; DOI: 10.1038/nm.3252
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Evidence has to come light.that, instead of arresting Tumor, it increases the risk and actually help growing Tumors!
SVEN HOPPE /SHUTTERSTOCK.COM Healthy cells damaged by chemotherapy secrete more of a protein called WNT16B, which boosts cancer cell survival
“Long considered the most effective cancer-fighting treatment, chemotherapy may actually make cancer worse, according to a shocking new study.
The extremely aggressive therapy, which kills both cancerous and healthy cells indiscriminately, can cause healthy cells to secrete a protein that sustains tumor growth and resistance to further treatment.
Researchers in the United States made the “completely unexpected” finding while seeking to explain why cancer cells are so resilient inside the human body when they are easy to kill in the lab.
They tested the effects of a type of chemotherapy on tissue collected from men with prostate cancer, and found “evidence of DNA damage” in healthy cells after treatment, the scientists wrote in Nature Medicine.
Chemotherapy works by inhibiting reproduction of fast-dividing cells such as those found in tumors.
The scientists found that healthy cells damaged by chemotherapy secreted more of a protein called WNT16B which boosts cancer cell survival.
The protein was taken up by tumor cells neighboring the damaged cells.
“WNT16B, when secreted, would interact with nearby tumor cells and cause them to grow, invade, and importantly, resist subsequent therapy,” said Nelson.
In cancer treatment, tumors often respond well initially, followed by rapid re-growth and then resistance to further chemotherapy.
Rates of tumor cell reproduction have been shown to accelerate between treatments.
“Our results indicate that damage responses in benign cells… may directly contribute to enhanced tumor growth kinetics,” wrote the team.
Causes for Obesity and weight gain have not been found conclusively.
By Dieting with the scant knowledge we have often impairs Health and results in loss of Stamina.
I have seen people who have been on Diet looking shrunken,frame is there but some thing is missing.
Also Dieting may damage metabolism.
Individuals are unique.
There can never be a standard Diet for all of us.
My suggestion,in the interest of your health, is,eat what you want in moderation.
Avoid junk food.
Shun snacks.
Take one breakfast , two meals a day.
Take fibrous food , vegetables and Fruits9( eat food not simply as a dessert, but eat when hungry-read my blog on How to eat fruit?)
Eat Dinner before 10 pm.
Have a good sleep.
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The most immediate reason that diets don’t work over the long term is that they promote a loss of the internal signals for hunger and fullness that are necessary for normal eating. This was the finding of a classic study conducted by Janet Polivy and Peter Herman at the University of Toronto, published in 1999. In this experiment, a group of dieters and a group of nondieters were given the task of comparing ice cream flavors. Participants in each group were divided into three subgroups. Before getting the ice cream, the first subgroup was asked to drink two milkshakes, the second subgroup was asked to drink one milkshake, and the third subgroup wasn’t given any milkshakes. Next, the researchers offered the groups three flavors of ice cream and asked the participants to rate the flavors, eating as much ice cream as they desired.
The results revealed that the nondieters ate as you might expect: those who hadn’t consumed any milkshakes ate the most ice cream, those who’d consumed one milkshake ate less ice cream, and those who’d consumed two milkshakes ate the least. The dieters, by contrast, reacted in the opposite way. Those who were offered no milkshakes before the taste test ate small amounts of ice cream, those who drank one shake ate more ice cream, and those who’d consumed two milkshakes ate the most ice cream!
The researchers termed what had happened to the dieters “disinhibition,” which occurs as a result of a “diet-mentality.” The milkshake preload had a different effect on dieters than on nondieters. Nondieters, eating in an unrestrained and normal manner, tend to regulate their food consumption according to internal physical cues of hunger and satiety. Therefore, in the experiment, nondieters regulated the amount of ice cream they ate based on perceived fullness. What could be more obvious and natural?
The dieters, however, reacted in the opposite way — the more milkshakes they consumed, the more ice cream they ate. Why did they lose the capacity to regulate their intake? According to the researchers, this “counterregulation” occurs because a milkshake preload disinhibits a dieter’s usually inhibited or restrained eating, almost like a switch: “I’ve blown it anyway, so I might as well keep eating before I go back on my diet.” This is an almost irresistible incentive to go on eating well past physical fullness.
The dieters, however, reacted in the opposite way — the more milkshakes they consumed, the more ice cream they ate. Why did they lose the capacity to regulate their intake? According to the researchers, this “counterregulation” occurs because a milkshake preload disinhibits a dieter’s usually inhibited or restrained eating, almost like a switch: “I’ve blown it anyway, so I might as well keep eating before I go back on my diet.” This is an almost irresistible incentive to go on eating well past physical fullness.
For example, metabolism plays a significant role in determining our weight. Resting metabolic rate refers to the amount of energy the body burns when not engaged in physical activity; it accounts for approximately 70 percent of the calories we burn each day. About 40 to 80 percent of the influence for resting metabolism is apparently inherited. In the journal Nature Medicine, Jeffrey Friedman, director of the Starr Center for Human Genetics, writes, “The commonly held belief that obese individuals can ameliorate their condition by simply deciding to eat less and exercise more is at odds with compelling scientific evidence indicating that the propensity to obesity is, to a significant extent, genetically determined.”
This inherited weight range, known as the set point, is the weight your body settles at when you’re eating in response to signals of hunger or fullness and engaging in some level of physical activity. Our set point acts like a thermostat, seeking to maintain our natural body weight within a range of 10 to 20 pounds. When we take in less food as fuel, our body deals with this reduction by slowing down to conserve energy. Metabolism is lowered, reducing the rate at which calories are burned. Within 24 to 48 hours of beginning a calorie-restricted diet, metabolic rate decreases 15 to 30 percent. Our body has successfully slowed itself down to defend against this self-imposed famine. By contrast, when our body takes in more food than it needs as fuel, the metabolism speeds up and burns calories more quickly. In her book Health at Every Size: The Surprising Truth about Your Weight, Linda Bacon, a physiologist specializing in nutrition and weight regulation, explains that when this mechanism is working properly, it functions as a force that pulls you back to your comfortable range whenever you veer away; however, if you consistently override your body’s signals of fullness, this system becomes broken. The goal is to find your healthy weight, keeping in mind that even if we all ate the same and exercised the same, we wouldn’t weigh the same. Weight is a complicated matter, which can be affected by a variety of factors, including medical issues, such as thyroid problems or polycystic ovary syndrome, the side effects of medications, poverty, stress, and lack of sleep.
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