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Frequently Asked Questions - PET/CT

How is PET/CT different from just PET or CT?
  • PET/CT combines two state-of-the-art technologies. PET (positron emission tomography) identifies metabolic changes in the body's cells, so it can determine if an area is cancerous. However, PET does a poor job of locating the cancer cells in the body. CT (computed tomography) solves the problem. It identifies the body’s structure, so it tells doctors the precise location of the cancer. The PET/CT thus can detect cancer in its very early stages, when it is most treatable. The equipment also combines the two images, which is invaluable for doctors.

    What all this means is that scans are more effective in pinpointing affected areas in the body, minimizing the need for exploratory surgery.
Why is PET/CT performed?
  • PET/CT is proven to be effective in the diagnosis and treatment of:
    • Breast cancer
    • Colorectal cancer
    • Esophageal carcinoma
    • Head and neck cancers
    • Lung cancer
    • Lymphoma
    • Melanoma
    • Myocardial viability and perfusion imaging
    • Pre-surgical evaluation of partial epilepsy
    • Thyroid cancer
How long will a PET/CT scan take?
  • You will receive an injection of a radioactive "tracer drug," which takes about 45 minutes for the body to absorb. The tracer mimics the way glucose is used in the body. This is important, because most types of cancer cells absorb glucose much faster than do normal cells. Therefore, those that absorb more of the glucose-like substance are likely to be cancerous.

    After the tracer is absorbed, the patient lies on a table, which moves through a gantry, or small tunnel. The gantry, which contains a CT scanner and a nuclear medicine camera, spins around the table, capturing high-speed images, including those produced by the tracer's emissions.

    A full-body scan takes about 30 minutes, approximately half the time of a traditional PET and CT scan. That can make a big difference in comfort and convenience, especially to seriously ill patients.
Why Are Oral And Intravenous Contrast Used In PET/CT?
  • Oral contrast is used to image the stomach and intestines. It is a very dilute, flavored barium solution that you drink approximately 1 hour prior to an examination.
  • Intravenous contrast is sometimes referred to as "dye". Although colorless, it contains iodine, which makes specific organs, blood vessels, and tissues visible on x-rays for better detection of disease or injury. It is not radioactive. We only use "non-ionic" contrast, which is formulated to minimize any risk of an allergic reaction. The risks and benefits of contrast will be explained to you when you arrive for your examination. Occasionally, mild allergic reactions may occur such as hives, rash or itching. In rare instances a patient may have a more severe allergic reaction, which might include difficulty breathing, swelling in the throat, or loss of consciousness. Our staff is fully trained and experienced to manage any potential adverse reaction.
  • Patients will be asked, and should notify our staff, if they have a history of allergy to IV contrast or iodine injections, diabetes, asthma, kidney disease, severe heart disease, multiple myeloma, sickle cell disease or are if they are taking glucophage.
Do I Need A Referral (Prescription) To Have My PET/CT Examination?
  • Yes, your doctor must provide a referral (prescription) in order for you to receive a examination. In addition, some insurance carriers or HMO’s require a precertification. Please discuss this with your doctor and your insurance company or HMO prior to your test.

Frequently Asked Questions - CT

What Is a Computed Tomography (CT) Scan Exam?
  • Computed Tomography (otherwise known as CT or "CAT" scanning) combines advanced computers and rotating x-rays to create highly detailed cross sectional computer generated images of body parts and internal organs in order to detect different disease processes. The exam is fast, patient friendly and has the unique ability to detect and diagnose a wide variety of medical conditions and abnormalities. It is frequently used as the primary diagnostic tool for early detection of tumors, infection, inflammatory conditions, stroke, obstructions, trauma and kidney stones. At MIB, these examinations are performed by certified radiologic technologists, and examinations are directly supervised and interpreted by board certified specialists in diagnostic radiology.
Why Is CT Performed?
  • CT can provide detailed cross sectional images and diagnostic information for nearly every part of the body that cannot be provided by conventional x-ray studies:
    • Head: including the brain, eyes, inner ear, and sinuses
    • Neck: including the throat, larynx, lymph nodes, salivary glands and thyroid gland
    • Chest: including the lungs, aorta, heart and mediastinum
    • Abdomen: including the liver, kidneys, pancreas, spleen, bile ducts, gallbladder, aorta and bowel
    • Pelvis: including the prostate, female reproductive organs, bladder and bowel
    • Skeletal system: including the hand, feet, hips, and facial bones
    • Spine: including the lumbar, thoracic and cervical spine
Do I Need A Referral (Prescription) To Have My CT Examination?
  • Yes, your doctor must provide a referral (prescription) in order for you to receive an examination. In addition, some insurance carriers or HMO’s require a precertification. Please discuss this with your doctor and your insurance company or HMO prior to your test.
Why Are Oral And Intravenous Contrast Used In CT?
  • Oral contrast is used to image the stomach and intestines. It is a very dilute, flavored barium solution that you drink approximately 1 hour prior to an examination.
  • Intravenous contrast is sometimes referred to as "dye". Although colorless, it contains iodine, which makes specific organs, blood vessels, and tissues visible on x-rays for better detection of disease or injury. It is not radioactive. We only use "non-ionic" contrast, which is formulated to minimize any risk of an allergic reaction. The risks and benefits of contrast will be explained to you when you arrive for your examination. Occasionally, mild allergic reactions may occur such as hives, rash or itching. In rare instances a patient may have a more severe allergic reaction, which might include difficulty breathing, swelling in the throat, or loss of consciousness. Our staff is fully trained and experienced to manage any potential adverse reaction, and our locaton on the GBMC campus means professional care is always available.
  • Patients will be asked, and should notify our staff, if they have a history of allergy to IV contrast or iodine injections, diabetes, asthma, kidney disease, severe heart disease, multiple myeloma, sickle cell disease or are if they are taking glucophage.
How Long Will My CT Examination Take?
  • The CT scan itself is 10-15 minutes. However, to ensure optimum results and patient safety, you will be asked to fill out a medical questionnaire and you will be interviewed by one of our staff before your examination. If applicable, contrast administration will be discussed and administered. A Radiologist will review the image quality of your study before you leave. Your visit should be less than 45 minutes
What If I Am Claustrophobic?
  • Because the CT is open at both ends (like a doughnut), most claustrophobic patients have little difficulty with the procedure. If you are severely claustrophobic, you might ask your doctor to consider a mild sedative.
IWhen Will I Know The Results Of My Examination?
  • Your study will be reviewed before you leave our facility to determine if the information is complete. Your results will be sent to your physician within 24 hours. Your physician will then  discuss the results with you. Urgent results will be telephoned immediately to your doctor.

Frequently Asked Questions - MRI

What is an MRI?
  • Magnetic resonance imaging (MRI) is an imaging technique used primarily in medical settings to produce high quality images of the inside of the human body. MRI is based on the principles of nuclear magnetic resonance (NMR), a spectroscopic technique used by scientists to obtain microscopic chemical and physical information about molecules. The technique was called magnetic resonance imaging rather than nuclear magnetic resonance imaging (NMRI) because of the negative connotations associated with the word nuclear in the late 1970's. MRI started out as a tomographic imaging technique, that is it produced an image of the NMR signal in a thin slice through the human body. MRI has advanced beyond a tomographic imaging technique to a volume imaging technique.
Why is my Doctor requesting an MRI?
  • An MRI is the modality of choice when your doctor requires top-quality anatomic portrayal, especially soft tissue. Neurologists are just one medical specialty that depends greatly upon MRI for accurate diagnostic information. Neurosurgeons, orthopedic surgeons and chiropractors as well as your internist also rely greatly on the diagnostic information that an MRI provides. 
Do I have to lie still during my MRI scan?
  • Yes.  It is important to minimize movement in order to achieve the best imaging results. Our relaxed and open environment naturally helps in patient comfort and therefore helps in the patient resting quietly. The patient may bring a family member or friend into the scan room to hold their hand and comfort them during the MRI procedure. 
What are the differences between an MRI scan and a CAT or CT scan?
  • They both use computers and are both used for diagnosis, but have very little in common. One of the most important differences between a CT scan and an MRI scan is the fact the CT scans use radiation and MRI scans do not. CT scans are computerized X-rays, MRIs use harmless radio waves and are diagnostically superior to CT scans, especially when evaluating soft tissue. In addition to superior soft tissue detail, MRIs provide much more flexibility in demonstrating cross-sectional planes of the body. Unlike a CT scanner which is relatively limited when it comes to plane selection, an MRI can provide a cross-sectional image taken at any plane in the human body.
How does an Open MRI compare to traditional closed magnets?
  • Traditionally, it was said that the quality of the Open MRI is not as good. With software and hardware technology vastly improving, our Open MRI provides optimal image quality comparable to some conventional MRI systems. Our Open MRI provides high performance and superior image quality.

Do I need a prescription for an MRI?

  • Yes. Only a Physician can prescribe an MRI.

What does the MRI scanning center staff need to know about me to prior to taking me into the MRI scanning room?

  • The technologist and radiologist must know about any metal implants! DO NOT allow yourself to be scanned if you have a pacemaker or other implanted mechanically, electronically or magnetically activated device. In most cases, your MRI can be performed even though you have metal implants, however unless specifically ordered by OUR radiologist, you will NOT be scanned if you have metal implants in the head region. We need your complete medical history, and we MUST know if you have any metal in your body which cannot be removed, including:
    • Pacemakers
    • Aneurysm clips
    • Implanted insulin pumps
    •  Vascular coils and filters
    • Heart valves
    • Ear implants
    • Surgical staples and wires
    • Shrapnel
    • Bone or joint replacements
    • Metal plates, rods, pins and/or screws
    • Contraceptive diaphragms or coils
    • Penile implants
    • Permanent dentures
    • Partial Dental plates
    • Stents
     

Why are MRIs so noisy?

  • The noise you are hearing is because of vibrating gradients that enable the scanner to collect data from a particular cross-sectional plane. The noise or gradient vibrations have been reduced to a minimum, enabling you to listen comfortably to your favorite CD or FM radio station.

 

If I have an MRI scan, how will I find out the results?

  • Your MRI scan will be read and dictated by our Board Certified Radiologist who is specifically trained in MRI technology. Our Radiologist will report his findings/results to your physician, and your physician will then discuss the results of your MRI with you.
 

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