Tag Archives: MRI

Magnetic resonance imaging (MRI) is a technique that uses a magnetic field and radio waves to create detailed images of the organs and tissues within your body.

CDI Miami | Wednesday February 22, 2017

MRIs can determine which babies will develop autism as toddlers

The first-of-its-kind study used MRIs to image the brains of infants, and then researchers used brain measurements and a computer algorithm to accurately predict autism before symptoms set in.

Using magnetic resonance imaging (MRI) in infants with older siblings with autism, researchers from around the country were able to correctly predict 80 percent of those infants who would later meet criteria for autism at two years of age.

“Our study shows that early brain development biomarkers could be very useful in identifying babies at the highest risk for autism before behavioral symptoms emerge,” said senior author Joseph Piven, MD, the Thomas E. Castelloe Distinguished Professor of Psychiatry at the University of North Carolina – Chapel Hill. “Typically, the earliest an autism diagnosis can be made is between ages two and three. But for babies with older autistic siblings, our imaging approach may help predict during the first year of life which babies are most likely to receive an autism diagnosis at 24 months.”

People with Autism Spectrum Disorder (or ASD) have characteristic social deficits and demonstrate a range of ritualistic, repetitive and stereotyped behaviors.

Using MRIs to screen infants gives parents powerful resources to address, if not prevent disorders. By taking MRIs of brain volume, surface area, cortical thickness at 6 and 12 months of age, and sex of the infants, in conjunction with a computer program; can help potentially identify infants who will later develop autism, before the symptoms of autism begin to consolidate into a diagnosis.

According to Dr. Piven, “Putting this into the larger context of neuroscience research and treatment, there is currently a big push within the field of neurodegenerative diseases to be able to detect the biomarkers of these conditions before patients are diagnosed, at a time when preventive efforts are possible,” Piven said. “In Parkinson’s for instance, we know that once a person is diagnosed, they’ve already lost a substantial portion of the dopamine receptors in their brain, making treatment less effective.”

CDI Miami | Thursday February 16, 2017

Breast Cancer: The Importance of Early Detection and Screening

Women in the United States have a 1 in 8 chance of getting breast cancer.  The good news is that

when breast cancer is detected early, it can be cured.  Studies show that the five-year survival rate for localized breast cancer is 97 percent, while the 12-year survival rate is 95 percent for cancers that are detected while still smaller than 1 centimeter in size.  The size of the cancer and how much it has spread are two of the most important factors contributing to the success of treatment.

 

The key to successful treatment is early detection and screening.  Screening exams are designed to find breast cancer while it is still small and localized – before it causes symptoms like an obvious lump.  Breast cancers detected after symptoms arise are usually bigger and are more likely to have spread to areas beyond the breast.  Early detection saves thousands of lives each year, so it’s important for women of all ages to know what tests are available and when to get them.

Breast Cancer Action Early Detection Saves Lives Logo

logo credit: Breast Cancer Action

Women Ages 50+

Women in their 50s are at the greatest risk of contracting breast cancer. What are some ways to prevent it? Watch your weight! Women who gain weight (20 pounds or more ) after menopause are significantly more likely to be diagnosed with breast cancer than women who maintain a healthy weight.

Maintain at least a yearly mammogram to monitor any possible breast cancer developments.
Women Ages 40 – 49

 

Women 40 and older should have a mammogram each year, as long as they are healthy and free from serious health problems like congestive heart failure, end-stage renal disease, dementia, etc.

 

Various types of mammograms are available today, including 2D film or digital mammograms and 3D mammograms.  Regardless of type, a mammogram is safe and is considered to be the best available test for detecting and diagnosing breast cancer.

 

Film, digital and 3D mammograms all use compression and a series of X-rays to generate pictures of internal breast tissue.  During the exam, the technician compresses the breast with a paddle and takes images from various angles to obtain the necessary pictures.

 

If a patient receives abnormal mammogram results, doctors often order a breast ultrasound or an MRI breast scan as a follow-up test.  These tests can zero in on a specific area identified by the mammogram, and they can help shed more light on whether the area in question might be a cyst or solid mass.  A breast ultrasound or MRI breast scan can also sometimes distinguish between benign and cancerous tumors and can help doctors determine whether steps such as a stereotactic breast biopsy are necessary.

 

Women in 20s and 30s

 

Younger women – those in their 20s and 30s – should have clinical breast exams every three years.  A CBE is usually done in conjunction with a mammogram and is an opportunity for women to discuss any changes in breast tissue, options for medical imaging scans, and any hereditary factors that could increase breast cancer risk.

 

A breast self-exam is another option for women starting in their 20s, and is something that can be done on a monthly basis throughout life.  While self-exams play a smaller part in detecting breast cancer compared to other methods, they nonetheless help women become familiar with how their breasts normally look and feel.  This makes it more likely that a woman will notice if a change occurs – perhaps a lump, swelling, pain, discharge, etc.  Many times these symptoms are not cancerous, but they should always be reported to a doctor so the appropriate follow up tests can be done.

 

For a woman in her 20s, the odds of contracting breast cancer are quite low; however, the risk does increase with age.  CBEs and self-exams enable women to know what is normal for them so they can immediately report any changes to their doctors.

 

High-Risk Women

 

Today, doctors use various risk assessment tools – such as the Gail model, the Claus model, and the Tyrer-Cuzick model – to help determine a woman’s risk for breast cancer.  These tools give approximations of risk based on various factors and data.  Genetic testing is also available and can identify whether a woman carries the BRCA1 or BRCA2 gene mutation.

 

For women who are identified as high-risk patients, experts recommend a yearly mammogram and MRI breast scan.  An MRI breast scan is used in addition to a mammogram, rather than in place of it.  While an MRI is more sensitive than a mammogram, it does miss some cancers that a mammogram can otherwise detect.

 

In most of these high-risk cases, the combination of mammograms and MRI breast scans should start at age 30 and continue as long as a woman is healthy enough to receive the tests.  However, the age to start the exams should take personal situations and needs into account and can be modified accordingly by the doctor and patient.

 

Women having any of the medical imaging scans mentioned above should do so at a certified diagnostic imaging center to ensure they receive the most accurate tests possible.  The Center for Diagnostic Imaging is proud to offer Comprehensive Breast Care Centers in the Miami area that offer all women access to life-saving mammograms, breast ultrasounds and MRI breast scans.

CDI Miami | Friday September 9, 2016

CT scan vs MRI

A CT Scan (or CAT Scan) is best suited for viewing bone injuries, diagnosing lung and chest problems, and detecting cancers. An MRI is suited for examining soft tissues in ligament and tendon injuries, spinal cord injuries, brain tumors, etc. CT scans are implemented in emergency rooms and the scan can take fewer than 5 minutes. An MRI, on the other hand, can take up to 30 minutes.

Advantages of MRI over CT Scan
 A CAT scan uses X rays to build up a picture. An MRI uses a magnetic field to do the same and has no known side effects related to radiation exposure.

 MRI gives higher detail in soft tissues

 Another advantage of MRI is the ability to change the imaging plane without moving the patient.

Advantages of CT Scan over MRI

 CT is best for imaging bone structures

 An MRI is contraindicated for patients with surgical clips, metallic fragments, cardiac monitors or pacemakers cannot receive an MRI.

 Treatment time is shorter than an MRI

 MRI cannot be done on claustrophobic patients as the patient has to remain inside a noisy machine for up to 45 minutes

 CT scans are less expensive than an MRI. A CT scan costs $1,200 to $3,200; while an MRI can cost upwards of $4,000.
Machine Cost

These machines can cost from several hundred thousand to millions of dollars – which explains why treatments are so expensive. A basic CT scan can cost between $ 85,000 to $150,000. A 16-slice scanner costs $145,000 to $225,000 and the top-of-the-line 64-slice CTs can cost up to $450,000. The machines may typically need annual maintenance, which can cost tens of thousands of dollars.

For more information about diagnostic imaging services in South Florida, contact us here. Call us Toll Free at 800-371-0002.

CDI Miami | Friday August 12, 2016

Do You Really Need That MRI?

Low back pain, headaches, heart palpitations; they could be minor, everyday health woes, or red flags that something serious is going on. Is it time to get an MRI?
With so many advances in medical technology at our fingertips in recent decades, doctors and patients have scurried to have images taken to rule out worst case scenarios.
The Choosing Wisely campaign was launched by the American Board of Internal Medicine Foundation about three years ago, said Dr. Richard Baron, president and CEO of the foundation. The goal behind it, he said, is to help physicians and patients make more informed decisions about medical interventions, based on medical evidence. In other words, only get that MRI or EKG, or pop that pill, if research has actually proven it’s likely to help in a case like yours.
“The idea is there are things we know get done a lot, but the evidence suggests we probably shouldn’t be doing them as much as we are doing them,” Baron told CBS News.
When the campaign first launched, there was some resistance, “It was counterintuitive to some professional societies and they said that some of their members may not like this because it is how they make their living,” Baron said. But it ended up causing quite a buzz, he added.
In a system where health care providers are being paid on a fee-for-service basis, more medical tests are going to be done than are needed, said Baron. “Some have just gotten into the habit of doing it and they think more is always better. And many patients think this, too,” Baron said.

 

The following are overused tests that should prompt serious discussion between doctors and patients. They include:

  • MRIs for headaches and low back pain
  • CMR, an imaging test for chest pain and cardiac screening
  • Whole body scans to screen for cancer
  • Some repeat colonoscopies
  • Certain mammograms, such as before elective breast surgery or after breast reconstruction
  • CT scan and MRI screening tests for brain aneurysms
  • Blood tests for miscarriage risk and urinary tract infections in older people

For neurology, Callaghan said, “MRIs for headaches and low back pain are overused. It’s one of the most-duplicated tests.”

 

 

 

 

CDI Miami | Wednesday June 29, 2016

MRI Links Saturated Fats to Breast Cancer in Postmenopausal Women

The presence of high saturated fatty acids in breast tissue may be a useful indicator of cancer in postmenopausal women, according to a new study by researchers at NYU Langone medical Center. The study was published online in Radiology, a journal of the Radiological Society of North America.

The researchers identified the relationship between fatty acids and breast cancer. Perhaps one day, these finding may lead to a greater understanding of the underlying mechanisms behind breast cancer development and the role of fat as a factor in breast cancer diagnosis and progression.

“Our study offers the first evidence — seen in breast tissue — that high saturated fatty acids in the breast adipose tissue is associated with presence of breast cancer in postmenopausal women,” said senior author and investigator Sungheon G. Kim, Ph.D., associate professor in the Department of Radiology at NYU Langone and a researcher at the Center for Advanced Imaging, Innovation and Research.

The relationship between body mass index (BMI), fat and cancer development has previously been studied, with postmenopausal women found to be at increased risk for breast cancer as their BMI increases. However, this study suggest the composition of the fat itself may play a role as well.

The relationship between body mass index (BMI), fat and cancer development has previously been studied, with postmenopausal women found to be at increased risk for breast cancer as their BMI increases. However, this study suggest the composition of the fat itself may play a role as well.

CDI Miami | Tuesday June 21, 2016

The ALARA Principal

Intrinsic to working in radiology is working with radioactive materials. Although we will always be exposed to some level of radiation, we use the ALARA principal (As Low As Reasonably Achievable) to keep exposure to a minimum.

 

This principle assumes that there is no threshold for inducing “biological effects” and therefore any dose of radiation carries with it some risk. In other words, there is no level of “safe” radiation.

 

Using the strategies of Time, Distance, and Shielding, we can keep radioactive exposure as low as reasonably achievable. This maximizes efficacy for your treatment and keeps everyone safe, especially our patients. Below is a list of techniques we use to minimize radiation exposure:

 

alara principle

    1. Safe delivery of radiopharmaceuticals – When the syringe is being held with the plunger or needle, we make sure that it is managed with the utmost precaution, and, we take advantage of remote injectors whenever possible.

 

  • Transportation of Patients – How close to the back of the wheelchair are we standing when transporting a patient? Do we maintain appropriate distance when we are walking them out of the department or when we enter the scan room?

 

 

  • Cleaning up spills (including patient blood or body fluids) – This relates to how quickly we isolate and remove fluids that could contaminate the scan room, or mitigate the effect of the treatment.

 

 

  • Holding / Lifting Patients – We pay particular attention to where we stand in relation to our patients, especially if we have our radiation badge on.

 

 

  • Radioactive Tracers – When using these in treatment, we make sure that the all the precautions are made, so that we can have a safe and efficient treatment.

 

 

  • During PET/CT/MRI Scans – We drape our patient’s bodies with a radioactive shield, isolating the exposure to only the areas that need treatment.

 

 

These techniques are just a tiny sample of the ways we consider your wellbeing during our examinations. For diagnostic imaging services, including PET/CT Scans, MRIs, and Mammograms contact the Center for Diagnostic Imaging in Miami.

 

 

CDI Miami | Tuesday May 17, 2016

How to survive an MRI or CAT scan if you’re claustrophobic

For some people, just thinking about an MRI is enough to provoke anxiety. For the approximately 9 percent of people diagnosed with claustrophobia, or a fear of enclosed spaces, “anxiety” is an understatement. Even for those without a clinical diagnosis, feelings of claustrophobia during an MRI are common.

However, there are many ways to overcome your fears before an MRI. Here are a few suggestions:

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CDI Miami | Tuesday April 5, 2016

Inside the Restless Mind: MRI Scans discover insomnia is linked to irregularities in the Brain’s Communication Networks

 

 

Everyone occasionally experiences sleepless nights of tossing and turning, waking up exhausted in dreary. For an insomniac, however, these experiences are not only regular, recent MRI scans suggest that there may be a connection between the sleeping disorder and irregularities in the brain communication networks.

mri insomnia

In a recent study of insomniacs published online in Radiology, researchers from the Department of Medical Imaging at Guangdong No. 2 Provincial People’s Hospital in Guangzhou, China, found reduced white matter in the thalamus, which regulates consciousness, sleep and alertness, and in the limbic system, which supports functions like emotion, behavior, motivation, long-term memory, and olfaction.

 

“White matter tracts are bundles of axons – or long fibers of nerve cells – that connect part of the brain to another,” said coauthor Shumei Li in a press release. She added: “If white matter tracts are impaired, communication between brain regions is disrupted.”

 

Li and her colleagues recruited 23 primary insomnia patients – those whose sleeplessness is not attributable to a medical, psychiatric, or environmental cause – and 30 healthy controls. All the participants answered questionnaires about the quality of their sleep and their levels of anxiety and depression.

 

The findings revealed that insomnia patients had signigicantly reduced white matter integrity in several parts of the right brain, including the body corpus callosum – the largest white matter structure of the brain – and the right thalamus. Researchers linked the reduced activity of the body corpus callosum to more severe insomnia and depression scored in the patients.

 

Dr. Lisa Fairweather, a psychiatrist in Colleyville, Texas, uses a car analogy to explain how the brain acts in patients who have difficulty sleeping.

 

“The brain is like a car with the engine of a Ferrari but the brakes of a bicycle. It performs extremely well switching gears and racing forward, but it suffers from an ability to slow down. This can be most obvious during bedtime,” she told Medical Daily .

 

Previous brain imaging studies have linked primary insomnia to brain abnormalities in young and middle-aged adults. A 2008 paper found that patients who have primary insomnia for more than six months showed a 30 percent reduction in gamma-aminobutyric acid, whose purpose is to decrease overall activity in many areas of the brain, helping to shut it down, especially when it’s time to sleep. This could be why insomniacs commonly complain that their minds keep racing and won’t quiet down at night.

 

This constant “on” state is one of hyperarousal, with unusually high levels of  cortisol, metabolic activity, and sympathetic activity when insomniacs are both awake and asleep, according to Dr. David Brown, a sleep psychologist at the Children’s Medical Center in Dallas.

 

Brown believes the biggest problem with insomnia is that it is not a single entity.

 

“There are many types of insomnia and many different causes. Insomnia severity may be short lived and acute, or chronic,” he told Medical Daily. “Some insomnias show difficulty falling to sleep, some have difficulty staying asleep, some wake too early and cannot get back to sleep.”

 


 

Source: Li S, Tian J, Bauer A et al. Reduced Integrity of Right Lateralized White Matter in Patients with Primary Insomnia: A Diffusion-Tensor Imaging Study. Radiology. 2016. Original Article

 

CDI Miami | Tuesday March 29, 2016

MRI helps predict preterm birth

MRI of the cervix is more accurate than ultrasound at predicting if some women will have a preterm birth, according to a new study from Italy appearing in the online edition of Radiology.

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CDI Miami | Tuesday February 9, 2016

Adding MRI to Mammography Could Help Detect Aggressive Breast Cancer

Breast imaging with magnetic resonance imaging (MRI) can detect a larger tumor burden than can mammography alone, which could impact treatment decisions, according to a study published in Radiology. The retrospective study demonstrated that of 2,021 newly diagnosed breast cancer patients, 285 patients (14%) had additional cancer detected by MRI, 73 of whom had cancers in a different quadrant of the breast than the index tumor.
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