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| Frequently Asked Questions - PET/CT |
How is PET/CT different from just PET or CT?
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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?
How long will a PET/CT
scan take?
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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?
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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.
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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.
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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?
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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.
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| Frequently Asked Questions - CT |
What Is a Computed Tomography (CT) Scan Exam?
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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?
Do I Need A Referral (Prescription)
To Have My CT Examination?
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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.
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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?
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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?
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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?
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| Frequently Asked Questions
- MRI |
What is an MRI?
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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?
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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?
What are the differences
between an MRI scan and a CAT or CT scan?
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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?
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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?
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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?
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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:
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Vascular coils and filters
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Surgical staples and wires
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Bone or joint replacements
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Metal plates, rods, pins and/or
screws
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Contraceptive diaphragms or coils
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- Stents
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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?
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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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