32 articles
3D computed tomography
3D computed tomography (3D CT) is an X-ray imaging method that reconstructs cross-sectional attenuation measurements into a volumetric dataset, rendered as 3D images for diagnosis and treatment planning.
Adaptive statistical iterative reconstruction
Adaptive statistical iterative reconstruction (ASIR) is a CT image reconstruction algorithm introduced by GE Healthcare in 2008 that models projection noise, cutting radiation dose by 25 to 65%.
Arterial phase CT
Arterial phase CT is a contrast-enhanced CT protocol that images arteries and hypervascular tumors during peak arterial enhancement, about 20 to 40 seconds after injection.
Cardiac computed tomography
Cardiac computed tomography (CCT) uses X-ray CT to visualize the heart and coronary arteries, most commonly as coronary CT angiography to rule out obstructive coronary artery disease.
Computed tomography myocardial perfusion imaging
Computed tomography myocardial perfusion imaging (CTP, also called CT-MPI) is a cardiac CT technique that measures myocardial blood flow during vasodilator stress to show whether coronary stenoses limit perfusion.
Cone-beam computed tomography reconstruction
Cone-beam computed tomography reconstruction is the set of algorithms converting cone-beam X-ray projections into 3D voxel images, used in dental imaging since the 1990s and in image-guided radiotherapy.
Contrast-enhanced computed tomography
Contrast-enhanced computed tomography (CECT) is a CT technique in which intravenous iodinated contrast makes vessels, organs, and lesions visible, used for tumors, infection, and vascular disease.
CT myocardial perfusion imaging
CT myocardial perfusion imaging is a cardiac computed tomography technique that measures blood flow through the heart muscle during pharmacological stress to identify significant coronary stenoses.
CT perfusion imaging
CT perfusion imaging, or CT perfusion, is a computed tomography technique that maps brain blood flow with injected contrast, mainly to select stroke patients for treatment.
CT simulation
CT simulation is the radiotherapy planning procedure in which a CT scan of a patient in the treatment position defines targets and organs at risk for radiation therapy.
Dual-energy computed tomography
Dual-energy computed tomography (DECT) acquires CT data at two X-ray energy spectra to characterize tissue composition, yielding iodine maps, virtual non-contrast images, and virtual monoenergetic images.
Dual-source computed tomography
Dual-source computed tomography (DSCT) is a CT technique using two X-ray tubes and detectors mounted 90° apart on one gantry, giving fast cardiac imaging and dual-energy material analysis.
Dynamic computed tomography
Dynamic computed tomography (dynamic CT) is a time-resolved form of CT that rapidly scans the same tissue after IV contrast, measuring blood flow and volume.
Dynamic contrast-enhanced CT
Dynamic contrast-enhanced CT (DCE-CT) is a computed tomography technique that acquires a rapid series of scans after intravenous iodinated contrast injection to quantify blood flow, blood volume, and permeability.
Four-dimensional computed tomography
Four-dimensional computed tomography is a CT acquisition and reconstruction method that resolves a scanned volume over the respiratory cycle, used mainly for radiation therapy planning of breathing tumors.
Intraoperative computed tomography
Intraoperative computed tomography (iCT) is the acquisition of CT scans in the operating room during surgery, letting surgeons verify implant position, assess residual tumor, and correct problems before closing.
Low-dose whole-body computed tomography
Low-dose whole-body computed tomography is a CT technique that images the entire body at reduced radiation dose, used to assess bone disease in multiple myeloma and stage cancer.
Micro-CT imaging
Micro-CT imaging, or microcomputed tomography, is an X-ray computed tomography technique producing quantitative 3D images of small specimens such as bone, soft tissue, and biomaterials, used mainly in preclinical research.
Non-contrast computed tomography
Non-contrast computed tomography (NCCT) is X-ray cross-sectional imaging performed without injected contrast agents, used as the fast, first-line emergency test for stroke, brain hemorrhage, and urinary stones.
PARADIGM study
PARADIGM (Progression of AtheRosclerotic PlAque DetermIned by Computed TomoGraphic Angiography Imaging) is a multinational serial CCTA registry of 2,252 patients quantifying coronary plaque progression, diabetes and statin effects, and MACE prediction.
Perfusion computed tomography
Perfusion computed tomography (CT perfusion, CTP) is a CT technique that maps blood flow in tissue, used mainly to select acute stroke patients for reperfusion therapy.
Photon-counting computed tomography
Photon-counting computed tomography (PCCT) is a CT technique whose detectors count individual X-ray photons, sharpening resolution and separating materials; the first clinical scanner, the Siemens NAEOTOM Alpha, was FDA-cleared in 2021.
Postmortem computed tomography
Postmortem computed tomography (PMCT) is the cross-sectional X-ray examination of a body after death, used in forensic death investigation to detect fractures, foreign bodies, gas, and fluid collections.
Rotational angiography
Rotational angiography is an X-ray technique in which a rotating C-arm reconstructs contrast-filled vessels into a 3D image, used mainly for cerebral aneurysms and cardiac imaging.
Sparse-view CT reconstruction
Sparse-view CT reconstruction is a computed tomography method that recovers diagnostic-quality images from far fewer projection angles than a standard scan, reducing radiation dose and acquisition time.
Spectral computed tomography
Spectral computed tomography is an X-ray imaging method that measures attenuation in separate energy ranges, producing iodine maps, virtual non-contrast images, and uric acid stone differentiation.
Spectral CT
Spectral CT, including dual-energy CT and photon-counting CT, is computed tomography that acquires X-ray attenuation data at two or more energy levels, enabling material decomposition and tissue characterization.
Spiral Cone-Beam Computed Tomography
Spiral cone-beam computed tomography, also called helical cone-beam CT, unites a cone-shaped x-ray beam with continuous spiral gantry rotation and table movement, first published in 1991.
Spiral CT
Spiral CT, also called helical CT, is a CT mode in which the tube rotates continuously while the table moves, scanning a whole volume in 20 to 60 seconds.
Virtual colonoscopy
Virtual colonoscopy, or CT colonography (CTC), is a noninvasive CT imaging test that detects colon polyps, ulcers, and cancer without sedation or endoscopy, used for screening.