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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
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Knowledge of anatomy is essential to understand human biology and medicine. Anatomists and health care professionals use standard terminology to describe the human body with more precision and no ambiguity. Anatomical terms have mostly Greek and Latin-derived roots. Because these languages are rarely used in conversation, the meaning of words remains the same. Each term is made up of a root in between the prefixes and suffixes. The root of a term often refers to an organ, tissue, or condition,...
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Anatomical Movements00:51

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Cerebrum: Anatomical Overview II01:11

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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
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Mapping 241Am Spatial Distribution Within Anatomical Bone Structures Using Digital Autoradiography.

George Tabatadze1, Brian W Miller2,3, Sergei Y Tolmachev1

  • 1US Transuranium and Uranium Registries, College of Pharmacy, Washington State University, 1845 Terminal Drive, Suite 201, Richland, WA 99354.

Health Physics
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Summary
This summary is machine-generated.

Digital autoradiography effectively visualizes Americium-241 (Am) microdistribution in bone. This method accurately quantifies radionuclide activity, proving superior to traditional techniques for heterogeneous samples.

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Area of Science:

  • Radiological Science
  • Nuclear Medicine
  • Biophysics

Background:

  • Investigating radionuclide distribution in human bone is crucial for understanding internal contamination.
  • Traditional methods for quantifying radionuclide activity in bone can be impractical for microscale analysis.

Observation:

  • Digital autoradiography using the ionizing radiation quantum imaging detector was applied to bone samples from US Transuranium and Uranium Registries case 0846.
  • Multiple bone specimens (humerus, clavicle) were sectioned and imaged to visualize Americium-241 (Am) distribution.
  • Detector images were superimposed on anatomical images to map Am in cortical bone, trabecular bone, and spongiosa.

Findings:

  • Americium-241 (Am) distribution was successfully visualized and quantified at a microscale within different bone regions.
  • Activity concentration ratios (trabecular-to-cortical, spongiosa-to-cortical) were calculated for humerus and clavicle samples.
  • Results from digital autoradiography showed strong agreement with radiochemical analysis and were compared to ICRP biokinetic model predictions.

Implications:

  • Digital autoradiography is an effective method for studying microscale heterogeneous radionuclide distribution in bone.
  • This technique offers a practical alternative to traditional counting methods for complex samples.
  • Findings contribute to improved biokinetic modeling and risk assessment for internal radionuclide contamination.