In this paper, we present the design and implementation of a new rendering method based on high d... more In this paper, we present the design and implementation of a new rendering method based on high dynamic range (HDR) lighting and exposure control. This rendering method is applied to create video images for a 3D virtual bronchoscopy system. One of the main optical parameters of a bronchoscope's camera is the sensor exposure. The exposure adjustment is needed since the dynamic range of most digital video cameras is narrower than the high dynamic range of real scenes. The dynamic range of a camera is defined as the ratio of the brightest point of an image to the darkest point of the same image where details are present. In a video camera exposure is controlled by shutter speed and the lens aperture. To create the virtual bronchoscopic images, we first rendered a raw image in absolute units (luminance); then, we simulated exposure by mapping the computed values to the values appropriate for video-acquired images using a tone mapping operator. We generated several images with HDR and others with low dynamic range (LDR), and then compared their quality by applying them to a 2D/3D video-based tracking system. We conclude that images with HDR are closer to real bronchoscopy images than those with LDR, and thus, that HDR lighting can improve the accuracy of image-based tracking.
Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display, 2006
Volume measurement plays an important role in many medical applications in which physicians need ... more Volume measurement plays an important role in many medical applications in which physicians need to quantify tumor growth over time. For example, tumor volume estimation can help physicians diagnose patients and evaluate the effects of therapy. These measurements can also help researchers compare segmentation methods. For researchers to quickly check the results of volume data processing, they need a graphical
Medical Imaging 2007: Visualization and Image-Guided Procedures, 2007
In this paper, we present the design and implementation of a new rendering method based on high d... more In this paper, we present the design and implementation of a new rendering method based on high dynamic range (HDR) lighting and exposure control. This rendering method is applied to create video images for a 3D virtual bronchoscopy system. One of the main optical parameters of a bronchoscope's camera is the sensor exposure. The exposure adjustment is needed since the
Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display, 2006
Dynamic or 4D images (in which a section of the body is repeatedly imaged in order to capture phy... more Dynamic or 4D images (in which a section of the body is repeatedly imaged in order to capture physiological motion) are becoming increasingly important in medicine. These images are especially critical to the field of image-guided therapy, because they enable treatment planning that reflects the realistic motion of the therapy target. Although it is possible to acquire static images and
Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display, 2006
4D images (3 spatial dimensions plus time) using CT or MRI will play a key role in radiation medi... more 4D images (3 spatial dimensions plus time) using CT or MRI will play a key role in radiation medicine as techniques for respiratory motion compensation become more widely available. Advance knowledge of the motion of a tumor and its surrounding anatomy will allow the creation of highly conformal dose distributions in organs such as the lung, liver, and pancreas. However,
Volume measurement plays an important role in many medical applications in which physicians need ... more Volume measurement plays an important role in many medical applications in which physicians need to quantify tumor growth over time. For example, tumor volume estimation can help physicians diagnose patients and evaluate the effects of therapy. These measurements can also help researchers compare segmentation methods. For researchers to quickly check the results of volume data processing, they need a graphical
Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling, 2009
Transbronchial needle aspiration (TBNA) is a common method used to collect tissue for diagnosis o... more Transbronchial needle aspiration (TBNA) is a common method used to collect tissue for diagnosis of different chest diseases and for staging lung cancer, but the procedure has technical limitations. These limitations are mostly related to the difficulty of accurately placing the biopsy needles into the target mass. Currently, pulmonologists plan TBNA by examining a number of Computed Tomography (CT) scan
2013 17th International Conference on System Theory, Control and Computing (ICSTCC), 2013
ABSTRACT A reduction of the size of the coronary artery openings, estimated by the visual inspect... more ABSTRACT A reduction of the size of the coronary artery openings, estimated by the visual inspection of the X-ray images of the transient radio contrast distribution during conventional angiography, can be used to formulate predictions about clinical symptoms and dynamic reductions in coronary blood flowing. Even with introduction of new noninvasive imaging modalities such as Cardiac CT and MRI, coronary angiography remains the gold standard for detecting ischemic coronary disease.
In this paper, we present the design and implementation of a new rendering method based on high d... more In this paper, we present the design and implementation of a new rendering method based on high dynamic range (HDR) lighting and exposure control. This rendering method is applied to create video images for a 3D virtual bronchoscopy system. One of the main optical parameters of a bronchoscope's camera is the sensor exposure. The exposure adjustment is needed since the dynamic range of most digital video cameras is narrower than the high dynamic range of real scenes. The dynamic range of a camera is defined as the ratio of the brightest point of an image to the darkest point of the same image where details are present. In a video camera exposure is controlled by shutter speed and the lens aperture. To create the virtual bronchoscopic images, we first rendered a raw image in absolute units (luminance); then, we simulated exposure by mapping the computed values to the values appropriate for video-acquired images using a tone mapping operator. We generated several images with HDR and others with low dynamic range (LDR), and then compared their quality by applying them to a 2D/3D video-based tracking system. We conclude that images with HDR are closer to real bronchoscopy images than those with LDR, and thus, that HDR lighting can improve the accuracy of image-based tracking.
Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display, 2006
Volume measurement plays an important role in many medical applications in which physicians need ... more Volume measurement plays an important role in many medical applications in which physicians need to quantify tumor growth over time. For example, tumor volume estimation can help physicians diagnose patients and evaluate the effects of therapy. These measurements can also help researchers compare segmentation methods. For researchers to quickly check the results of volume data processing, they need a graphical
Medical Imaging 2007: Visualization and Image-Guided Procedures, 2007
In this paper, we present the design and implementation of a new rendering method based on high d... more In this paper, we present the design and implementation of a new rendering method based on high dynamic range (HDR) lighting and exposure control. This rendering method is applied to create video images for a 3D virtual bronchoscopy system. One of the main optical parameters of a bronchoscope's camera is the sensor exposure. The exposure adjustment is needed since the
Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display, 2006
Dynamic or 4D images (in which a section of the body is repeatedly imaged in order to capture phy... more Dynamic or 4D images (in which a section of the body is repeatedly imaged in order to capture physiological motion) are becoming increasingly important in medicine. These images are especially critical to the field of image-guided therapy, because they enable treatment planning that reflects the realistic motion of the therapy target. Although it is possible to acquire static images and
Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display, 2006
4D images (3 spatial dimensions plus time) using CT or MRI will play a key role in radiation medi... more 4D images (3 spatial dimensions plus time) using CT or MRI will play a key role in radiation medicine as techniques for respiratory motion compensation become more widely available. Advance knowledge of the motion of a tumor and its surrounding anatomy will allow the creation of highly conformal dose distributions in organs such as the lung, liver, and pancreas. However,
Volume measurement plays an important role in many medical applications in which physicians need ... more Volume measurement plays an important role in many medical applications in which physicians need to quantify tumor growth over time. For example, tumor volume estimation can help physicians diagnose patients and evaluate the effects of therapy. These measurements can also help researchers compare segmentation methods. For researchers to quickly check the results of volume data processing, they need a graphical
Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling, 2009
Transbronchial needle aspiration (TBNA) is a common method used to collect tissue for diagnosis o... more Transbronchial needle aspiration (TBNA) is a common method used to collect tissue for diagnosis of different chest diseases and for staging lung cancer, but the procedure has technical limitations. These limitations are mostly related to the difficulty of accurately placing the biopsy needles into the target mass. Currently, pulmonologists plan TBNA by examining a number of Computed Tomography (CT) scan
2013 17th International Conference on System Theory, Control and Computing (ICSTCC), 2013
ABSTRACT A reduction of the size of the coronary artery openings, estimated by the visual inspect... more ABSTRACT A reduction of the size of the coronary artery openings, estimated by the visual inspection of the X-ray images of the transient radio contrast distribution during conventional angiography, can be used to formulate predictions about clinical symptoms and dynamic reductions in coronary blood flowing. Even with introduction of new noninvasive imaging modalities such as Cardiac CT and MRI, coronary angiography remains the gold standard for detecting ischemic coronary disease.
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Papers by Teo Popa