CT

tomography

[to-mog´rah-fe] any method that produces images of single tissue planes. In conventional radiology, tomographic images (body section radiographs) are produced by motion of the x-ray tube and film or by motion of the patient that blurs the image except in a single plane. In reconstruction tomography (CT and PET) the image is produced by a computer program.computed tomography (CT) (computerized axial tomography (CAT)) a radiologic imaging modality that uses computer processing to generate an image (scan" >CAT scan) of the tissue density in a “slice” as thin as 1 to 10 mm in thickness through the patient's body. These images are spaced at intervals of 0.5 to 1 cm. Cross-sectional anatomy can be reconstructed in several planes without exposing the patient to additional radiation.

Since its introduction in 1972, the use of this modality has grown rapidly. Because it is noninvasive and has high contrast resolution, it has replaced some radiographic procedures using contrast media. It also has a better spatial resolution than scintillation imaging (about 1 mm for CAT compared to 15 mm for a scintillation camera).
A CAT scan is divided into a square matrix of pixels (picture elements). The newer CAT scanners use a high resolution matrix with 256 × 256 or 512 × 512 pixels. The region of the tissue slice corresponding to a pixel has a cross-sectional area of 1 × 1 mm to 2 × 2 mm; because of the thickness of the slice, it has a finite height and is therefore referred to as a voxel (volume element).
The actual measurements made by the scanner are the x-ray attenuations along thousands of rays traversing the slice at all angles. The attenuation value for a ray is the sum of the values for all of the voxels it passes through. A computer program called a reconstruction algorithm can solve the problem of assigning attenuation values for all the pixels that add up to the measured values along each ray.
The attenuation values are converted to CAT numbers by subtracting the attenuation value of water and multiplying by an arbitrary coefficient to produce values ranging from −1000 for air to +1000 for compact bone with water as 0. CT numbers are sometimes expressed in Hounsfield units, named after Godfrey Hounsfield, the inventor of the CT scanner; Hounsfield and Allan Cormack were co-winners of the Nobel Prize in physiology or medicine in 1979 for the development of computerized axial tomography.

Computed tomography. Relative position of the x-ray tube, patient, and detectors in a fourth generation CT unit.electron beam computed tomography (EBCT) ultrafast tomography" >computed tomography done with a scanner in which the patient is surrounded by a large circular anode that emits x-rays as the electron beam is guided around it.extended narrow tomography tomography involving an increase in amplitude and increase in exposure angle resulting in greater thinness of the cut for examination.linear tomography tomography in which the tube and film move in the same direction.narrow angle tomography a type of tomography that results in thicker sections for examination.pluridirectional tomography tomography in which there is a great deal of movement in a variety of directions.positron emission tomography (PET) a combination of tomography" >computed tomography and scanning" >scintillation scanning. Natural biochemical substances or drugs tagged with a positron-emitting radioisotope are administered to the subject by injection; the tagged substance (tracer) then becomes localized in specific tissues like its natural analogue. When the isotope decays, it emits a positron, which then annihilates with an electron of a nearby atom, producing two 511 keV gamma rays traveling in opposite directions 180 degrees apart. When the gamma rays trigger a ring of detectors around the subject, the line between the detectors on which the decay occurred is stored in the computer. A computer program (reconstruction algorithm), like those used in computed tomography, produces an image of the distribution of the tracer in the plane of the detector ring.

Most of the isotopes used in PET scanning have a half-life of only 2 to 10 minutes. Therefore, they must be produced by an on-site cyclotron and attached chemically to the tracer and used within minutes. Because of the expense of the scanner and cyclotron, PET is used only in research centers. However, PET is important because it provides information that cannot be obtained by other means. By labeling the blood with ¹¹C-carbon monoxide, which binds to hemoglobin, images can be obtained showing the regional perfusion of an organ in multiple planes. By using labeled metabolites, images can be obtained showing metabolic activity of an organ. ¹⁵O-oxygen and ¹¹C-glucose have been used for brain imaging and ¹¹C-palmitate for heart imaging. ⁸¹Rb, which is distributed like potassium, is also used for heart imaging. By using labeled neurotransmitters, hormones, and drugs the distribution of receptors for these substances in the brain and other organs can be mapped.single-photon emission computed tomography (SPECT) a type of tomography in which gamma photon–emitting radionuclides are administered to patients and then detected by one or more gamma cameras rotated around the patient. From the series of two-dimensional images produced, a three-dimensional image can be created by computer reconstruction. The technique improves resolution of, and decreases interference by, overlapping organs. It is used particularly for assessment of cardiac disease, stroke, and liver disease; for staging of cancer; and to diagnose physical abnormalities through evaluation of function.ultrasonic tomography the ultrasonographic visualization of a cross-section of a predetermined plane of the body; see ultrasonography" >B-mode ultrasonography.

CT

Abbreviation for computed tomography.

CT

abbr.1. Central Time2. also Ct. Connecticut3. computed tomography

CT

Abbreviation for:
computed tomography (Medspeak-UK)
carbon tetrachloride
cardiac type
cardiothoracic
carotid tracing
carpal tunnel
cellular telephone
cellular therapy
Centre for Information Technology (Medspeak-UK)
cerebral thrombosis
cerebral tumour
chemical test
chemotherapy
chest tube
child trends
chlorothiazide
cholera toxin
chorda tympani
chymotrypsin
ciguatoxin
circadian time (circadian rhythm, see there)
circulation time
clinical tutor (Medspeak-UK)
clotrimazole
clotting time
coated tablet
cognitive therapy
collecting tubule
compressed tablet
confirmatory test
constitutive transcript
contrast
conventional therapy
connective tissue
continue treatment
contraceptive technique
Coombs’ test
core training (Medspeak-UK)
corneal transplant
coronary thrombosis
corrected transposition
corrective therapist
cortical plate thickness
corticosterone
cover test (ophthalmology)
crista terminalis
crossmatch:transfusion
cystine-tellurite (medium)
cytotechnologist

CT

Computed tomography, see there; also 1. Carpal tunnel.2. Chemotherapy.3. Chest tube.4. Cognitive therapy, see there.5. Connective tissue.6. Continue treatment.7. Crossmatch:transfusion.8. Cytotechnologist.

CT

Abbreviation for computed tomography.

Ct

Abbreviation for concentration-time product.

CT or CAT

Computed tomography, a radiologic imaging that uses computer processing to generate an image of tissue density in slices through the patient's body.Mentioned in: Histiocytosis X, Situs Inversus

CT

Abbreviation for computed tomography.

Patient discussion about CT

Q. My brother is alcoholic.Doctor had told to have blood test, CT scan.What exactly he facing? My brother is alcoholic. He had made his family life like a hell. He beats his wife every day. He argues with mom on every simple issue and makes it complex. He dislikes his children and has no compassion for them. He had lost on his job. He fights with our neighbors and has made life hell for us to live here in this apartment. I don’t know now a days he going though a very bad problem he dislikes eating. Due to that he had lost on his weight and feels weak. His eyes are pale and body temperature is very high. Doctor had told to have blood test, CT scan. What exactly he facing...is this very serious? Please give some genuine information.A. YES HIS PROBLEM IS VERY SERIOUS,but right now,HE is the ONLY one that can help himself....YOU AND YOUR FAMILY SHOULD WORRY ABOUT YOURSELVES at thi point.SUGGEST;;;for your family not to give him money---suggest..if he is living at home with mother/you..put him out.THAT IS THE ONLY THING THAT WILL STOP THE DRAMA,and ABUSE....HIS WIFE SHOULD GO TO COURT AND GET A ORDER FOR HIM NOT TO COME AROUND HER AND THE KIDS,NEXT TIME HE STARTS SHIT...CALL THR POLICE....THIS IS HIS PROBLEM NOT YOURS...you cant save your brother..he is not going to listen to you with alcohol and drugs in his system...you can suggest going into detox and then into rehab and a drug program,alcoholism and drug use can destroy your family..if you and the family dont get help----you can find people who will talk to you about your problem at ALCOHOLICS ANONYMOUS/NORCOTICS ANONYMOUS..800#..help line...GO TO (INTHEROOMS.COM).....peace mrfoot56

Q. I get bad headaches had ct scans and m.r.i. even sinus surgery, suffering 2yrs now, dizzness occurs too.. A. If all prior medical investigations turned out normal, and sinus surgery didn't help relieve your symptoms, I would suggest the reason for your headaches is probably migraine attacks, that can cause severe headaches, and no CT scan or MRI can diagnose them. The diagnosis is made clinically, by your doctor. Migraine headaches can be eased by proper medications, before and during an attack. You should consult a neurologist.

More discussions about CT

ct

Words starting with ct:

CT
CT Communications
CT or CAT scan
CT pulmonary angiography
CT transformer
CT, USA
CT-A
CT-Guided Needle Aspiration Biopsy
CT-RTS
CT-TSA
Ct/ct
CT/OS
CT110
CT15
CT26
CT31
CT4ME
CT7
CT8M
CTA Account
CTAA
CTABC
CTACK
CTADS
CTAF
cTAGE-1
CTAH
CTAI
CTD
ctene
Cteniod
Ctenocephalides canis
ctenoid
Ctenophora
ctenophore genus
Ctesiphon
CTL
ctr.
Ctrl vs. Caps Lock
CTT

CT (company)
CT guided
CT pelvimetry
CT scan
CT unit
CT-1
CT-B
CT-HRP
CT-scan Follow-up
ct.
CT/LM
CT/ST
CT125
CT1S
CT29
CT3IP
CT51
CT72
CT9
CTA Accounts
CTAAB
CTABT
CTACS
CTAE
CTAFM
cTAGE-2
CTAHC
CTAIG
CTDS
Ctenidae
Ctenizidae
Ctenocephalides felis
Ctenoidean
Ctenophorae
Ctenophores
ctetology
ctn
ctrl
Ctrl-@
CTU

CT and MRI
CT myelogram
CT Plus
CT scanner
CT venography
Ct-100
CT-CTL
CT-O
CT-SMAC
CT/AT/FP
CT/LN
CT1
CT127
CT2
CT2P2
CT4
CT58
CT73
CT90
CTA-21
CTAAC
CTAC
CTAD
CTAEC
CTAFS
CTAGE1
CTAHPERD
CTC
CTE
ctenidia
Ctenizoidea
Ctenocephalus
Ctenoidei
ctenophoran
Ctenophoric
CTFgamma
CTO
Ctrl (button)
CTS
CTV

CT Colonography
CT myelography
CT postcode area
CT scanning
CT virtual colonoscopy
CT-2
CT-guided
CT-ORH
CT-TACF
CT/CAT
CT/LW
CT102
CT13
CT21.1
CT3
CT48
CT6
CT82
CT99
CTA1
CTAAP
CTACA
CTADD
CTAEO
CTAG
CTAGE2
CTAHR
CTCL.
Ctenadena
ctenidium
cteno-
Ctenocyst
Ctenopharyngodon
ctenophore
Ctenostomata
CTG
CTP
Ctrl key
CTSC
CTV (disambiguation)

CT Colonoscopy
CT number
CT pulmonary angiogram
CT scans
CT&E
CT-4
CT-Guided Biopsy
CT-RCFM
CT-TCM
CT/CCD
CT/MRI
CT105
CT133
CT21.21
CT3.5
CT4CT
CT63
CT89
CTA
CTA2/B
CTAB
CTACE
CTADE
CTAEYC
CTAGE
Ctags
CTAHS
CTCS
Ctenarian
cteniform
Ctenocephalides
Ctenohystrica
Ctenopharyngodon idella
ctenophore family
Cteph
CTI
CTR
CTRL SPACE
CTSS
CTZ

CT

Acronym	Definition
CT➣Court
CT➣Count
CT➣Connecticut (US postal abbreviation)
CT➣Central Time
CT➣Carat
CT➣Computed Tomography (imaging technique)
CT➣Contact Time
CT➣Counter
CT➣Central African Republic
CT➣Clinical Trial
CT➣Communications Technology
CT➣Computer Technology
CT➣Critical Thinking
CT➣Cape Town (South Africa)
CT➣Christianity Today (magazine)
CT➣Come Together (Beatles song)
CT➣Canadian Tire
CT➣Current Transformer
CT➣Clock Tower (computer game)
CT➣Contracting
CT➣Chicago Tribune
CT➣Common Terms
CT➣Canterbury (postcode, United Kingdom)
CT➣Computerized Tomography
CT➣Control Techniques (Emerson Electric Company; St. Louis, MO)
CT➣Census Tract
CT➣Combination Therapy
CT➣Cellular Telephone
CT➣Computerized Axial Tomography (also see CAT; CT is preferred)
CT➣Classroom Teacher
CT➣Certification Test
CT➣Cooling Tower
CT➣Clinical Terms
CT➣China Town
CT➣carton
CT➣Cycle Time
CT➣Changing Times (journal)
CT➣Charlize Theron (actress)
CT➣Cognitive Therapy
CT➣Constant Temperature
CT➣Connective Tissue
CT➣Charitable Trust
CT➣Coffee Time
CT➣Charge Transfer
CT➣Carbon Tetrachloride
CT➣Clone Trooper (Star Wars)
CT➣Cross Talk
CT➣Computer Telephony
CT➣Clock Time
CT➣Cold Turkey
CT➣Certification Testing
CT➣Conspiracy Theory (movie)
CT➣Counseling and Testing
CT➣Control Tower
CT➣Chaos Theory
CT➣Counterterrorism
CT➣Cigarette Tax (various locations)
CT➣Core Team
CT➣Comité Technique (French: Technical Committee)
CT➣Cable Tray
CT➣Calcitonin
CT➣Counter Terrorist
CT➣Cherished Teddies (Enesco collectible figurines)
CT➣Chrono Trigger (video game)
CT➣Canada Trust
CT➣Can't Talk
CT➣CALTRANS (California Department of Transportation)
CT➣Country Team
CT➣Cordless Telephone
CT➣Crazy Taxi (Dreamcast game)
CT➣Computer Technician
CT➣Cholera Toxin
CT➣Coiled Tubing (oil & gas)
CT➣Channel Tunnel (England/France)
CT➣Connection Time
CT➣Combustion Turbine
CT➣Cut Throat
CT➣Coattails (multi-game guild)
CT➣Copper Tube
CT➣Crimp Tool
CT➣Clotting Time (test of blood)
CT➣Computer Terminal
CT➣Carboxyl-Terminal
CT➣Complementary Therapy
CT➣Chemical Test
CT➣Charge Time (gaming)
CT➣Calendar Time
CT➣Crazy Town (band)
CT➣Chris Tucker (actor)
CT➣Corey Taylor (Slipknot)
CT➣Corporate Technology
CT➣Compensatory Time
CT➣Club Triumph (UK)
CT➣Contact Team
CT➣Commissario Tecnico (Italian: national's soccer team Head Coach)
CT➣Cocteau Twins (band)
CT➣Cold Tolerance
CT➣Critical Technology (EU program)
CT➣Catania, Sicilia (Italian province)
CT➣City Temple (Cardiff, UK)
CT➣Cyber Terrorism
CT➣Conformance Testing
CT➣Cable, Test
CT➣Conflict Transformation
CT➣Calf Thymus
CT➣Collaborative Tools
CT➣Chemical Terrorism
CT➣Credit Time (US NIH)
CT➣Captain Tsubasa (Japanese comic)
CT➣Communication Trench
CT➣Communications Technician (AWACS communications position)
CT➣Conning Tower
CT➣Community Title (Australia)
CT➣Control Task
CT➣Cloud Top
CT➣Church Times (UK)
CT➣Control Transformer
CT➣Cross Traffic
CT➣Cover Test (ophthalmology)
CT➣Control Telemetry (US DoD)
CT➣Competition Tribunal (Canada)
CT➣Colour Television
CT➣Creative Touring (Lexus)
CT➣Commission de la Transparence (French healthcare quality-assessment agency)
CT➣Cordless Telecommunications
CT➣Coal Terminal
CT➣Center Thickness (of contact lens)
CT➣Coat and Tie
CT➣Cipher Text
CT➣Communications Terminal
CT➣Color Transparency
CT➣Compact Tension (metallurgy)
CT➣Computer-aided Tomography (less common)
CT➣Calgary Transit
CT➣Cloud Type
CT➣Contractor Test
CT➣Center-Tapped (electrical: transformer)
CT➣Collecting Tubule
CT➣Central Teaching
CT➣Catechesi Tradendae (On Catechesis in our Time)
CT➣Commercial Thinning (forestry)
CT➣Condensed Tannin
CT➣Communist Terrorists (British Malayan Conflict)
CT➣Customer Test
CT➣Constitutional Tribunal
CT➣Ceská Televize (Czech Television)
CT➣Contractor Testing
CT➣Continuation Training
CT➣Crawler Transporter (NASA)
CT➣Clamp Terminal
CT➣Creatine Transporter (genetics)
CT➣Certificate of Teaching
CT➣Commissioning Team
CT➣Combined Testing
CT➣Certificate of Transliteration
CT➣Combined Trial
CT➣Classic Trilogy (Star Wars)
CT➣Cazic Thule (Everquest)
CT➣Cable Tunnel
CT➣Circle Trip (airlines)
CT➣Cum Tempore (Latin: at a later date)
CT➣Certified Translator (American Translators Association)
CT➣Clear Trunk
CT➣Cable Telemetry
CT➣Cortico-Thalamic
CT➣Central Transition
CT➣Cryptologic Technician (formerly Communications Technician; USN Rating)
CT➣Charlie Tango (ham radio)
CT➣Client Task
CT➣Certified Thanatologist
CT➣Career Trainee
CT➣Conformance Tester
CT➣Command Transmitter
CT➣Cavitation Tunnel
CT➣Chemical Titles (periodical)
CT➣Combat Trains
CT➣Comparison Text
CT➣Compatibility Technology
CT➣Certified in Thanatology: Death, Dying and Bereavement (Association for Death Education and Counseling)
CT➣Contraterrene (anti-matter, science fiction)
CT➣Compensation Theorem
CT➣CoachTrack (coaching software by Eclipse Computing)
CT➣Card-To-Tape
CT➣Cadet in Training (Texas A&M Corps of Cadets)
CT➣Coordinated Turn Model
CT➣Channel Terminator
CT➣Chimney Tray
CT➣Common Tier
CT➣Chlamydia Trochomatis
CT➣Confederation Test
CT➣Cedar Trust
CT➣Confederation Text
CT➣Cascaded Triplet
CT➣Chiropractic Technologist
CT➣Cognizant Test
CT➣Cognitive Turnover (work psychology)
CT➣Curve-to-Tangent Point
CT➣Circular Trunking
CT➣Create Tasker
CT➣Cooperative Trust Company of Canada

CT

CT

ct

CT

CT

Ct.

ct.

CT

CT

Connecticut State Information

List of Connecticut counties:

Connecticut Parks

CT

CT

CT

tomography

CT

CT

CT

CT

CT

Ct

CT or CAT

CT

Patient discussion about CT

CT

CT

ct

Words starting with ct:

CT

CT

Synonyms for CT

noun a New England state

Synonyms

Related Words

noun a method of examining body organs by scanning them with X rays and using a computer to construct a series of cross-sectional scans along a single axis

Synonyms

Related Words