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Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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Imaging Studies for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
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X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

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Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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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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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
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Related Experiment Video

Updated: Feb 28, 2026

Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function
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Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function

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ReXVQA: A Large-scale Visual Question Answering Benchmark for Generalist Chest X-ray Understanding.

Ankit Pal1, Jung-Oh Lee2, Xiaoman Zhang3

  • 1Saama AI Research, Saama Technologies, India3Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA, ankit.pal@saama.com.

Pacific Symposium on Biocomputing. Pacific Symposium on Biocomputing
|February 27, 2026
PubMed
Summary

ReXVQA, a new benchmark for chest X-ray visual question answering, shows AI models now outperform human radiologists in interpretation tasks. This advancement sets a new standard for AI in medical imaging analysis.

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Area of Science:

  • Radiology and Artificial Intelligence
  • Medical Imaging Analysis
  • Natural Language Processing in Healthcare

Background:

  • Existing visual question answering (VQA) benchmarks for chest radiology often rely on template-based queries.
  • There is a need for a comprehensive benchmark that reflects diverse and clinically authentic radiological reasoning skills.

Purpose of the Study:

  • To introduce ReXVQA, the largest benchmark for VQA in chest radiology.
  • To evaluate the performance of state-of-the-art multimodal large language models (LLMs) on clinically relevant radiological tasks.
  • To compare AI performance against human expert radiologists.

Main Methods:

  • Developed ReXVQA with 694,481 questions and 160,000 chest X-ray studies.
  • Included five core radiological reasoning skills: presence assessment, location analysis, negation detection, differential diagnosis, and geometric reasoning.
  • Evaluated eight SOTA LLMs and conducted a human reader study with 3 senior radiology residents.

Main Results:

  • The best model, MedGemma, achieved 83.24% overall accuracy on the ReXVQA benchmark.
  • MedGemma outperformed the best human reader (77.27% accuracy) in a reader study.
  • AI models showed distinct performance patterns compared to human readers, with variable inter-reader agreement.

Conclusions:

  • ReXVQA establishes a new standard for evaluating generalist radiological AI systems.
  • AI performance now exceeds human evaluation on chest X-ray interpretation tasks, a significant milestone.
  • The benchmark facilitates the development of next-generation AI systems for expert-level clinical reasoning.