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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.
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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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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Segmentación de Tomografía Computarizada por Aprendizaje Automático de Código Abierto para el Diagnóstico de

Akshay Sankar1, Michael R Kann1, Samuel Adida1

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El análisis de aprendizaje automático de las unidades Hounsfield (UH) de tomografía computarizada (TC) muestra una fuerte correlación con las mediciones de densidad mineral ósea (DMO) de la absorciometría de rayos X de energía dual (DXA). Este método automatizado de TC ofrece un enfoque consistente y eficiente para la estratificación del riesgo de osteoporosis.

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Área de la Ciencia:

  • Radiología
  • Imágenes Médicas
  • Investigación de Osteoporosis

Sus antecedentes:

  • La DXA es el estándar para la evaluación de la DMO, pero tiene limitaciones.
  • Las unidades Hounsfield (UH) de las TC ofrecen una alternativa potencial para la estratificación del riesgo de osteoporosis.
  • El aprendizaje automático (ML) puede segmentar la anatomía de TC y derivar métricas de DMO.

Objetivo del estudio:

  • Evaluar una plataforma automatizada de segmentación por TC.
  • Investigar la relación entre las UH vertebrales y la DMO basada en DXA.
  • Evaluar la densidad de UH derivada de TC para la estratificación del riesgo de osteoporosis.

Principales métodos:

  • Análisis retrospectivo de 229 pacientes con TC lumbar y DXA concurrentes.
  • Se utilizó el modelo de ML TotalSegmentator para la segmentación de la columna lumbar.
  • Se calculó la densidad de UH del cuerpo vertebral, el hueso trabecular y el hueso cortical y se comparó con las puntuaciones T de DXA.

Principales resultados:

  • Las UH medias de L1-L5 se correlacionaron significativamente con las puntuaciones T de DXA para el cuello femoral, la columna lumbar y la cadera.
  • Las personas sanas presentaron UH vertebrales más altas en comparación con las personas con osteopenia.
  • Las UH derivadas de TC predijeron la baja DMO y la osteoporosis, identificándose valores umbral óptimos.

Conclusiones:

  • La segmentación de TC impulsada por ML proporciona una evaluación robusta y consistente de la densidad ósea vertebral.
  • Las unidades Hounsfield vertebrales se correlacionan bien con las mediciones de DMO de DXA.
  • El análisis automatizado de TC ofrece un método eficiente para la estratificación del riesgo de osteoporosis.