摘要:
Embodiments of radiographic imaging systems; digital radiography detectors and methods for using the same can monitor and/or control trap occupancy levels in photosensors of radiographic sensors (e.g., DR FPDs). In exemplary radiographic imaging apparatus embodiments, monitoring of trap occupancy or change in trap occupancy of the photosensor can determine whether an imaging array or detector panel has reached a stable operating point. In another embodiment, trap occupancy information can be used (a) to enable a generator (e.g., x-ray source) for a radiographic exposure and/or (b) to adjust to or to maintain a change in trap occupancy level at pre-determined set-point or to adjust to or maintain a change in trap occupancy level within a prescribed range (e.g., using clock signals and bias voltages applied to the photosensor).
摘要:
Embodiments of radiographic imaging systems; digital radiography detectors and methods for using the same can monitor and/or control trap occupancy levels in photosensors of radiographic sensors (e.g., DR FPDs). In exemplary radiographic imaging apparatus embodiments, monitoring of trap occupancy or change in trap occupancy of the photosensor can determine whether an imaging array or detector panel has reached a stable operating point. In another embodiment, trap occupancy information can be used (a) to enable a generator (e.g., x-ray source) for a radiographic exposure and/or (b) to adjust to or to maintain a change in trap occupancy level at pre-determined set-point or to adjust to or maintain a change in trap occupancy level within a prescribed range (e.g., using clock signals and bias voltages applied to the photosensor).
摘要:
An X-ray diagnosis apparatus including two X-ray detectors which have a plurality of detection elements. The two X-ray detectors are adjacent each other. Readout units read out electric charge from detection elements on the outer parts of the detectors before reading out the electric charge from detection elements on the inner parts where the detectors meet. A display unit displays an X-ray image data which is created by the electric charge read out from the detectors.
摘要:
A method for forming an assembled image from successive sub-images comprises the step of acquiring the sub-images, notably X-ray images, with an X-ray detector comprising an essentially flat X-ray-sensitive surface. An X-ray examination apparatus comprises an X-ray detector having a flat X-ray sensitive surface. Advantageously, difference images are derived from successive sub-images. For example, the assembled image derived from the difference images is used to display blood flow patterns in a patient's vascular system.
摘要:
Procédé permettant d'afficher sur un écran les détails d'une lésion de l'artère coronaire dans un appareil de cinéangiographie, en réglant chaque image du cinéangiogramme de sorte que la lésion s'affiche en continu en un endroit prédéterminé sur l'écran de visualisation. Le reste de l'anatomie cardiaque bouge, à l'arrière-plan, et dépasse un segment artériel fixe, ceci permettant au personnel médical de pouvoir plus facilement identifier et examiner le segment artériel affiché sur l'écran. Les images cinéangiographiques sont numérisées, traitées par un processeur (201) et décalées numériquement pour placer le segment artériel dans pratiquement le même endroit de visualisation dans chaque image. Des images séquentielles peuvent être présentées à l'observateur sous forme de paires stéréoscopiques, pour produire la pseudostéreopsie. Le segment artériel apparaît pour l'observateur en premier plan, comme s'il flottait devant le reste de l'anatomie cardiaque. On peut ensuite traiter par processus informatique des images pour faciliter l'examen par le personnel médical. Le processeur peut effectuer des mesures quantitatives du cinéangiogramme et peut afficher les résultats de ces mesures pour faciliter le réexamen du cinéangiogramme. On peut faire la moyenne des images pour réduire le bruit d'origine quantique et pour atténuer le bruit provenant de la structure; on peut comparer les images à d'autres cinéangiogrammes précédents pour augmenter la clarté ou le contraste. Des modifications apportées aux coordonnées d'un cinéangiogramme peuvent apporter une aide pour orienter les procédures thérapeutiques, ou peuvent aider à améliorer d'autres procédures d'imagerie telles que la radioscopie.
摘要:
A control panel (34), which includes a programmable electroluminescent touch screen (48) and a joystick (46), is mounted so as to be operable by the radiologist during a PTCA procedure. A bedside monitor (20) displays fluoro and roadmap information during the procedure. The radiologist can adjust the relative weight of the roadmap information to the fluoro information by operating the joystick.
摘要:
In an X-ray imaging system, images of a moving bolus of contrast medium are acquired by the emission of X-ray radiation pulses through an object to be imaged while controlling the longitudinal movement of an X-ray imaging device of said system in a continuously sweeping manner over said object. For limiting motion induced blur in the acquired images to an acceptable level, X-ray exposure values are developed which limit the duration of the X-ray pulses so that they do not exceed a predetermined maximum duration. In a preferred embodiment multiple passes of the imaging device are made over the object.
摘要:
A method for forming an energy subtraction image comprises the steps of recording a plurality of radiation images of an object on recording media by irradiating several kinds of radiation with different energy levels to the object, which is constituted of a plurality of tissues exhibiting different levels of radiation absorptivity with respect to the several kinds of radiation with different energy levels, and then detecting a plurality of original image signals representing the plurality of the radiation images. A first image signal, which represents a first image primarily composed of patterns of first tissues of the object, is generated from the plurality of the original image signals. A first smoothed image signal is generated by processing the first image signal, the first smoothed image signal representing a first smoothed image in which noise components of the first image have been reduced or eliminated. A second image signal is generated by subtracting the first smoothed image signal from an original image signal, the second image signal representing a second image primarily composed of patterns of second tissues of the object.