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Topic: CT scans

	NHRG - CT Scans
		The CT scanner is operated by rotating an x-ray tube around your body while measuring the constantly changing absorption of the x-ray beam by different tissues in your body.
		CT pulmonary angiogram involves injection of a contrast material into a vein in the arm and CT imaging of veins to detect a suspected blood clot in the lungs.
		CT scanning is very sensitive to bone making it a good imaging choice for detecting fractures and visualizing particularly small bones such as facial bones.
	www.northhertsradiologygroup.co.uk /ct.html (2385 words)

	CT Scanning of the Body (Computed Tomography or CAT Scan)
		CT examinations are often used to plan and properly administer radiation treatments for tumors, to guide biopsies and other minimally invasive procedures and to plan surgery and determine surgical resectability.
		CT scanning causes no pain, and with spiral CT the need to lie still for any length of time is reduced.
		A radiologist, who is a physician experienced in CT and other radiology examinations, will analyze the images and send a signed report with his or her interpretation to the patient's personal physician.
	www.radiologyinfo.org /content/ct_of_the_body.htm (2060 words)

	CT Scans
		CT images are in thin slices, showing multiple sections of the region being examined.
		CT scans are commonly used to picture the brain, chest, heart, lungs, abdomen, pelvis, bones, blood vessels, and sinuses.
		In other instances, for example during a CT scan of the abdomen or pelvis, the patient is often required to drink a liquid containing a contrast dye to better outline the stomach or intestines during the scan.
	www.fortcollinsradiology.com /ct.html (778 words)

	BrighamRAD - CT Scan: A Guide for Patients
		One explanation might be that CT scans may not detect some tumors that involve the inner lining of the abdomen, called the "peritoneum." We are working on ways to improve our ability to detect cancer in that location.
		For a routine CT scan, the level of radiation to the patient is about four times higher than the normal annual radiation dose from natural sources (sun, soil, food, water) to which the patient is exposed.
		There is scientific evidence that CT scans of the colon (“virtual colonoscopy“), the lung (“lung cancer screening“), and the heart (“coronary screening“; “coronary calcium screening“) may be beneficial for healthy people who are at an increased risk for getting a particular disease (colon cancer, lung cancer, heart attack).
	brighamrad.harvard.edu /patients/education/ct/ctguide.html (2841 words)

	CT scan
		CT scanning has also proven invaluable in pinpointing tumours and planning treatment with radiotherapy.
		CT scanning can also be used to guide biopsies and therapeutic pain procedures.
		During the scan the patient lies on a bed, with the body part under examination placed in the round tunnel or opening of the scanner.
	www.netdoctor.co.uk /health_advice/examinations/ctgeneral.htm (874 words)

	CT Scanning of the Abdomen (Computed Tomography or CAT Scan)
		CT is often the preferred method for diagnosing many different cancers, including colon cancer, since the image allows a physician to confirm the presence of a tumor and to measure its size, precise location and the extent of the tumor's involvement with nearby tissue.
		A CT examination of the gastrointestinal tract requires the use of a contrast material (this may be barium, iodine or in some cases water) to enhance the visibility of certain tissues.
		A radiologist, who is a physician experienced in CT and other radiologic examinations, will analyze the images and send a signed report with his or her interpretation to the patient's primary care physician.
	www.radiologyinfo.org /content/ct-abdomen.htm (1807 words)

	NN+S > CT Scans
		CT scans are helpful tools for studying internal organs and virtually any part of the body.
		If your doctor has told you that he wants to do a CT scan "with contrast," this means that you will be given an agent such as iodine dye that is used to highlight specific areas within the scan.
		CT scans are helpful tools for studying virtually any part of the body.
	www.nwnasalsinus.com /ct_scans (1019 words)

	Whole Body Scanning
		This use is referred to as whole-body CT scanning or whole-body CT screening, and it is marketed as a preventive or proactive healthcare measure to healthy individuals who have no symptoms or suspicion of disease.
		CT is a diagnostic imaging procedure that uses x rays to obtain cross-sectional images of the body.
		Although there are several ongoing investigational studies of the effectiveness of using CT to screen people, the studies are focused on high-risk groups for specific diseases (e.g., cigarette smokers for lung cancer).
	www.fda.gov /cdrh/ct (723 words)

	Sinus CT Scan, Sinusitis - W. S. Tichenor, M. D.
		Note that the CT scan is a computerized X-Ray taken in the same way as the first diagram is drawn, as if you were able to look head on into the sinuses.
		On the CT scan, bone appears white, air appears fl, and soft tissue, fluid, or muscle is varying shades of gray.
		Of note in the bottom portion of the scan is a ray pattern emanating from the teeth.
	www.sinuses.com /ctscan.htm (1600 words)

	CT scan
		CT scans (or CAT scan as it is sometimes called) stands for Computerised (Axial) Tomography.
		A CT scanning machine is a large machine that is shaped rather like a doughnut.
		This is a CT scan of the pelvis marked for radiotherapy treatment.
	www.cancerhelp.org.uk /help/?page=148 (1735 words)

	Full Body CT Scans - What You Need to Know - Brochure
		CT is recognized as an invaluable medical tool for the diagnosis of disease, trauma, or abnormality in patients with signs or symptoms of disease.
		CT screening of high-risk individuals for specific diseases such as lung cancer or colon cancer is currently being studied, but results are not yet available.
		The radiation from a CT scan may be associated with a very small increase in the possibility of developing cancer later in a person's life.
	www.fda.gov /cdrh/ct/ctscansbro.html (576 words)

	CT Scan, Cincinnati Children's Hospital Medical Center (Site not responding. Last check: 2007-11-07)
		If your child is having an abdomen CT scan, we may have you arrive 1 - 2 hours before your scan time to drink the oral contrast.
		The CT technologist or nurse will come to you when it is time for the test.
		When the CT pictures are complete, your child will lie on the table for a few moments longer while a radiologist checks to make sure there are enough pictures.
	www.cincinnatichildrens.org /health/info/growth/procedure/ct-scan.htm (911 words)

	physics central physics in action - ct scans
		A CT image is composed of pixels, whose brightness corresponds to the absorption of x-rays in a thin rectangular slab of the cross-section, which is called a “voxel.”
		The geometry of the CT Scan; the x-ray tube and detectors rotate, with the axis of rotation running from the patient's head to toe.
		Since the CT scan requires so many x-ray exposures, the amount of radiation used to make a CT scan is typically greater that used to make a traditional x-ray.
	www.physicscentral.com /action/action-02-3.html (519 words)

	CT Scans (Site not responding. Last check: 2007-11-07)
		If you are having a CT scan because you are donating a kidney or liver, you should NOT drink oral contrast.
		CT scans of the neck, head, spine, chest, or extremities may need IV contrast, but oral contrast will not be used.
		CT scans may be done at both buke North and Duke South Radiology Departments.
	www.radweb.mc.duke.edu /info/ctscan.htm (512 words)

	Computed Tomography (CT): Questions and Answers, Cancer Facts 5.2 (Site not responding. Last check: 2007-11-07)
		In cancer, CT is used to detect a tumor, provide information about the extent of the disease, help plan treatment, and determine whether the cancer is responding to treatment (see Question 2).
		For most people, the CT scan is performed on an outpatient basis at a hospital or a doctor’s office, without an overnight hospital stay.
		One type of virtual endoscopy, known as CT colonography or virtual colonoscopy, is under study as a screening technique for colon cancer.
	cis.nci.nih.gov /fact/5_2.htm (1035 words)

	Article : Review Article - Imaging of Pulmonary Thromboembolism ; Author : A Kohli ; Co-Author(s) : D Rajput, M Gomes, ... (Site not responding. Last check: 2007-11-07)
		A Spiral CT Angio of the pulmonary arteries is performed from the apices to the bases of the lung.
		Scan collimation is 3mm with a pitch of 2.
		Spiral CT had a sensitivity of 75% and specificity of 89%, compared to MRI with a sensitivity of 46% and specificity of 90%.(6) The role of MRI today is as a second line of investigation if spiral CT is contraindicated.
	www.ijri.org /articles/archives/2002-12-2/thoracic_207.htm (2023 words)

	CT Scans for lung cancer scans and lung cancer screening
		The spiral CT scan is a painless procedure in which a special computerized tomography imaging machine rotates rapidly around the body, taking over one hundred pictures in sequence.
		The scan is so sensitive that it's possible to detect nodules that are too small to be seen on a conventional x-ray, which make it an excellent tool in lung cancer screening.
		In fact a new study on CT scans and lung cancer conducted by the Early Lung Cancer Action Project, published in the July 1 issue of Cancer, offers new evidence that annual computed tomography screening for patients at high risk of lung cancer is cost-effective.
	www.bodyscan.md /spiralct_scanning.html (231 words)

	Scans resolve mystery over King Tut’s death - Science - MSNBC.com
		CAIRO, Egypt - The results of a CT scan done on King Tut’s mummy indicate the boy king was not murdered, but may have suffered a badly broken leg shortly before his death at age 19 — a wound that could have become infected, Egypt’s top archaeologist said Tuesday.
		About 1,700 images were taken of Tut’s mummy during the 15-minute CT scan aimed at answering many of the mysteries that shrouded his life and death — including his royal lineage, his exact age at the time of his death and the reason he died.
		The study, which was the first CT scan on a member of Egypt’s ancient royalty, showed that Tut was of a slight build, well-fed and healthy and suffered no major childhood malnutrition or infectious diseases.
	www.msnbc.msn.com /id/7128729?GT1=6305 (892 words)

	Computerized tomography - MayoClinic.com
		A CT scan, however, reveals these bones and organs as well as your pancreas, adrenal glands, ureters and blood vessels — all with a higher degree of precision.
		During the CT scan, a technologist is in a separate room supervising your exam and monitoring the images as they appear on the computer screen.
		During the CT scan, you're briefly exposed to ionizing radiation.
	www.mayoclinic.com /invoke.cfm?id=FL00065 (1281 words)

	CT Scans
		CT scans can be manipulated by the computer to give a 3-D picture of the body.
		CT scans usually do not cause any discomfort for adults, even if they have to drink a "contrast" dye.
		The CT scanner at Riley does not make that much noise and they just got a new one that looks like a donut with a hole in it that moves around her so she doesn't have to change positions.
	www.acor.org /ped-onc/treatment/CT/CTscans.html (2075 words)

	Computerized Tomography - RadiologyChannel.net
		The so-called cat scan (CT) has become the bread-and-butter test of medical imaging; though there are those MRI advocates who would rate their test higher than CT. Notwithstanding, it is correct to say that CT is very good for some things and MRI is good for other things.
		In some institutions, the abdominal CT scan has become the screening test for severe abdominal pain when renal stones, appendicitis, or diverticulitis is suspected.
		Also, CT scans are very involved studies that require numerous images, may require reformatting, and may also require review of previous studies.
	radiologychannel.net /computerizedtomography (1723 words)

	MedlinePlus Medical Encyclopedia: Abdominal CT scan
		The CT scanner is a free-standing machine with a large hole in the center.
		CT scans and other X-rays are monitored and regulated to provide the minimum amount of radiation exposure needed to produce the image.
		During pregnancy, an abdominal CT scan is usually not recommended, because there is some evidence of risk to the fetus.
	www.nlm.nih.gov /medlineplus/ency/article/003789.htm (771 words)

	CNN.com - CT scans can save lives, so who should get one? - June 1, 2001
		Businesses across the country are now offering CT scans to healthy people, promising to find the earliest signs of disease.
		Typically, doctors scan patients who are showing signs of symptoms of a problem.
		Doctors say if you want to get scanned, be sure the provider uses state-of-the-art CT scan technology, and there's a board-certified radiologist to interpret the results.
	archives.cnn.com /2001/HEALTH/06/01/body.scan (506 words)

	Association Between Head CT Scans and Cataracts Disputed
		Because they can also be brought on by radiation injury, there had been some concern that having CT scans could increase their incidence.
		And, although CT scan rates were also similar in a side-by-side comparison of the studies, the Blue Mountains team did not find the association between CT scan history and cataract presence that the Beaver Dam study had shown.
		There did originally seem to be a higher association between repeated CT scans and the prevalence of a certain type of common cataract.
	my.webmd.com /content/article/21/1728_54397 (519 words)

	CT scans
		Routine Computer Assisted Tomography (CT, CAT) scans are very helpful in detecting necrotic marrow and bone in the rounded ends of long bones, but they have not proven to be effective in detecting alterations in the marrow spaces of the facial bones.
		On the other hand, the new generation of spiral CT scans can provide very thin-sliced views, as thin as 1.0-1.5 mm., and such views are often able to detect not just destroyed marrow of the facial bones but marrow which has undergone ischemic damage but is still viable.
		Vertical CT slice shows large bilobed cavitation immediately behind and between the roots of the maxillary right incisors (left white arrows).
	www.maxillofacialcenter.com /CTscans.html (339 words)

	MRI & CT
		CT is used to assist in biopsies (removal of tissuefor laboratory testing) and abscess drainages.
		Parents are encouraged to remain in the CT room during the exam.
		Depending on your CT examination, you may be asked to drink only clear liquids and abstain from solid foods the night before the examination.
	www.cheyrad.com /mri.html (1087 words)

	Effective Dose From CT Scans
		For chest CT, a GE Hi-Speed CT/i scanner operated at a tube potential of 120 kVp and a scan time of one second is assumed (240 - 260 mAs).
		For abdominal CT, a GE Hi-Speed scanner operated at 120 kVp, with mAs varying between 200 - 350 mAs (approximately, depending on patient size), is assumed.
		It is intended to be a convenient reference for estimating radiation effective dose to from CT, under the stated conditions.
	www.safety.duke.edu /radsafety/ct_ed (450 words)

	Who's Afraid of CT Scans?
		Of course, CAT Scan 2000 and others point to people whose scans found cancers and other diseases that would have otherwise went undiagnosed.
		As Ronald Bailey notes in an article on private CT scans for Reason, the medical profession has a long history of wanting to keep patients from having direct access to diagnostic tests.
		The CT scanning dispute is reminiscent of the debate in the 1990s over whether women should have access to the test for the BRCA breast cancer gene.
	brian.carnell.com /archives/years/2002/05/000044.html (436 words)

	MedlinePlus: CT Scans
		Computerized Tomography (CT, CT Scan, CAT Scan) (Mayo Foundation for Medical Education and Research)
		Cardiac CT for Calcium Scoring (American College of Radiology, Radiological Society of North America)
		Pediatric CT (Computed Tomography) (American College of Radiology, Radiological Society of North America)
	www.nlm.nih.gov /medlineplus/ctscans.html (294 words)

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