Explore chapters and articles related to this topic
Cardiovascular System:
Published in Michel R. Labrosse, Cardiovascular Mechanics, 2018
The atria are relatively small and thin-walled, reaching peak pressures of approximately 10 mmHg. They require only a minimal contraction to “top up” the ventricular volume, since most of the blood coming into the atria will directly flow into the ventricles during diastolic filling. The ventricles are divided by a muscular interventricular septum and contract simultaneously. The right ventricle will eject blood into the pulmonary circulation and develop peak pressures of approximately 30 mmHg. On the other hand, the left ventricle will eject blood into the higher-pressure, higher-resistance systemic circulation and will develop pressures of approximately 120 mmHg. To handle such high blood pressure, the muscle wall of the left ventricle is much thicker than that of the right ventricle.
A two step workflow for pulmonary embolism detection using deep learning and feature extraction
Published in Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2023
G. Olescki, João M.C. Clementin de Andrade, Dante L. Escuissato, Lucas F. Oliveira
The first data set available (named ‘FUMPE’) comes from Masoudi et al. (2018), which is composed of 35 CTAs, with two exams not having any PE. A radiologist with 5 years of experience in chest tomography exams produced the segmentation masks, which then were reviewed by another radiologist with 18 years of experience. The data set has 8,792 slices and 3,438 PE regions of interest, with the height and width of the voxels ranging between 0.52 and 0.78 mm. Most PEs (67%) were found in peripheral arteries. In addition to the markings, the authors have also provided metadata, such as the proportion of the size of the right ventricle and left ventricle of the heart, whether there was reflux in the inferior vena cava, whether the interventricular septum is straight, the pulmonary artery diameter and the value of Qanadli score, which is calculated based on the position of the thrombus within the lung.