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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
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Related Experiment Video

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A Whole Body Dosimetry Protocol for Peptide-Receptor Radionuclide Therapy PRRT: 2D Planar Image and Hybrid 2D+3D SPECT/CT Image Methods
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Dual time-point quantitative SPECT-CT parathyroid imaging using a single computed tomography: feasibility and

Simin Razavi1, Blair Ziebarth, Ran Klein

  • 1Division of Nuclear Medicine, The Ottawa Hospital, Ottawa, Ontario, Canada.

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|November 4, 2017
PubMed
Summary

Dual-phase parathyroid scans using SPECT-CT are feasible for diagnosing parathyroid disease. Co-registering early and delayed SPECT-CT images, particularly with delayed CT by experienced operators, improves diagnostic precision.

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Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging
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Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging

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Area of Science:

  • Nuclear Medicine
  • Radiology
  • Endocrinology

Background:

  • Dual-phase parathyroid scintigraphy with Tc-sestamibi is standard for diagnosing parathyroid adenoma and hyperplasia.
  • Conventional imaging involves early and delayed planar images, followed by a single SPECT-CT acquisition.
  • Performing SPECT-CT at both early and delayed time points is clinically valuable but often avoided due to increased radiation exposure from computed tomography (CT).

Purpose of the Study:

  • To explore the feasibility of co-registering early and delayed SPECT-CT data from a single CT acquisition.
  • To evaluate the most effective combination of early and delayed SPECT-CT images for co-registration.
  • To assess the impact of operator experience on the accuracy and precision of quantitative measurements.

Main Methods:

  • Fourteen retrospective patients with available early and delayed planar and SPECT-CT images were included.
  • Contemporaneous early and delayed SPECT-CT served as the gold standard.
  • Non-contemporaneous SPECT-CT acquisitions were processed with manual alignment by experienced and novice operators to assess inter- and intraoperator variability.

Main Results:

  • Co-registration of SPECT-CT from different time points yielded good image quality without bias.
  • Co-registration of early SPECT with delayed CT demonstrated higher precision compared to other combinations.
  • Experienced operators achieved significantly better precision and intraoperator variability than novice operators.

Conclusions:

  • Quantitative standardized uptake value (SUV) measurements from co-registered early and delayed parathyroid SPECT-CT are feasible.
  • The optimal approach involves experienced operators manually registering delayed CT with early SPECT data.
  • This method offers a viable alternative for improved diagnostic accuracy in parathyroid imaging.