Abstract: In a blood flow measuring apparatus, a data processor in a computer determines three parameters from a (?CT value of CT image data corresponding to) time-course change, consisting of a test region rate constant K, an arterial blood rate constant Ka, and a xenon partition coefficient ?. A blood flow f is determined using the determined rate constant K, and the xenon partition coefficient ?.

Abstract: In a blood flow measuring apparatus, a data processor in a computer determines three parameters from a (?CT value of CT image data corresponding to) time-course change, consisting of a test region rate constant K, an arterial blood rate constant Ka, and a xenon partition coefficient ?. A blood flow f is determined using the determined rate constant K, and the xenon partition coefficient ?.

Abstract: A respiration control apparatus connected to a controlled body includes a respiration circuit having an inhalation circuit and an exhalation circuit. The inhalation circuit includes a first solenoid-operated valve and a first check valve. The exhalation circuit includes a vent valve, a dehumidifying chamber, a pressure detector, a second check valve, and a second solenoid-operated valve. A central processor closes the first solenoid-operated valve and the second solenoid-operated valve based on a respiration control signal supplied from a synchronizing signal output control device, disconnecting the respiratory system of the controlled body from the outside of the respiration control apparatus.

Abstract: The level of a respiration signal obtained from a laser sensor or the like is indicated on a respiration monitor according to an output condition set by synchronizing signal output control device. While the level of the respiration signal is indicated on the respiration monitor, a synchronizing signal output device outputs a synchronizing signal according to the output condition and the respiration signal to an X-ray control device, which controls a high-voltage generating device to energize an X-ray source to apply X-rays to an examinee.

Abstract: After a syringe containing a radioactive sample therein and housed in a radiation shield case is mounted on a radioactive sample holder and set in a radioactive sample measuring apparatus, an upwardly projecting handle of the radioactive sample holder is depressed to cause a syringe holder base supported on second shafts to lower a flange of the syringe held by the syringe holder base, pulling the syringe out of the radiation shield case. Then, the amount of radioactivity of the radioactive sample contained in the syringe is measured.

Abstract: Gamma rays obtained from radioisotope administered to an examinee are detected by a gamma ray information-detecting unit so that a first tomographic image obtained therefrom is formed on a CRT. Further, a second tomographic image of the examinee detected by using an ultrasonic wave information-detecting unit juxtaposed with respect to the gamma ray information-detecting unit is formed while making the second tomographic image overlap on the first tomographic image. Thus, it is possible to obtain a tomographic image in which relative positional relationship of tissue is clear.

Abstract: After a syringe containing a radioactive sample therein and housed in a radiation shield case is mounted on a radioactive sample holder and set in a radioactive sample measuring apparatus, an upwardly projecting handle of the radioactive sample holder is depressed to cause a syringe holder base supported on second shafts to lower a flange of the syringe held by the syringe holder base, pulling the syringe out of the radiation shield case. Then, the amount of radioactivity of the radioactive sample contained in the syringe is measured.

Abstract: A radiation source distribution image of an examinee is formed by driving X direction movement motors to move a radiation information-detecting unit in the X direction, and detecting radiation from the examinee on a stretcher placed between guide rails by using a collimator and a line sensor which constitute a detection unit.

Abstract: A valve has a cylindrical body made of a metal material, a screw section formed on a first attachment hole in the body, a first seal member provided on an upper surface of the body, a third seal member attached to an upper surface of the first attachment hole, a valve plug arranged in a second attachment hole for being seated on a valve seat, a flange section curved outwardly from an outer circumferential surface of the body, and a spring interposed between the valve plug and a spring-receiving member provided in the second attachment hole.

Abstract: After the position of a collimator with respect to a gamma camera depending on the position of a detection plane in an examinee, gamma rays radiated from the examinee are detected by a scintillation detector via a collimator and a scintillator, and a signal from the scintillation detector is processed by a signal processing circuit and then transferred to an image reconstructing unit, which reconstructs a three-dimensional image of the radiation source in the examinee and displays the three-dimensional image on a display unit.

Abstract: A respiration control apparatus connected to a controlled body includes a respiration circuit having an inhalation circuit and an exhalation circuit. The inhalation circuit includes a first solenoid-operated valve and a first check valve. The exhalation circuit includes a vent valve, a dehumidifying chamber, a pressure detector, a second check valve, and a second solenoid-operated valve. A central processor closes the first solenoid-operated valve and the second solenoid-operated valve based on a respiration control signal supplied from a synchronizing signal output control device, disconnecting the respiratory system of the controlled body from the outside of the respiration control apparatus.

Abstract: The level of a respiration signal obtained from a laser sensor or the like is indicated on a respiration monitor according to an output condition set by synchronizing signal output control device. While the level of the respiration signal is indicated on the respiration monitor, a synchronizing signal output device outputs a synchronizing signal according to the output condition and the respiration signal to an X-ray control device, which controls a high-voltage generating device to energize an X-ray source to apply X-rays to an examinee.

Abstract: A valve comprises a cylindrical body made of a metal material, a screw section formed on a first attachment hole in the body, a first seal member provided on an upper surface of the body, a third seal member attached to an upper surface of the first attachment hole, a valve plug arranged in a second attachment hole for being seated on a valve seat, a flange section curved outwardly from an outer circumferential surface of the body, and a spring interposed between the valve plug and a spring-receiving member provided in the second attachment hole.

Abstract: A small-size gamma camera is capable of reliably and quickly detecting the accumulated position of a radiation source in an examinee. When the examinee is scanned with the gamma camera which has an area sensor comprising 256 (16×16) semiconductor detecting elements, display elements of a display unit on a rear panel of the gamma camera are turned on to display a pattern indicative of the accumulated position of the radiation source. According to the displayed pattern on the display elements, the operator of the gamma camera moves the gamma camera to detect the accumulated position of the radiation source reliably within a short period of time.

Abstract: A radiation source distribution image of an examinee is formed by driving X direction movement motors to move a radiation information-detecting unit in the X direction, and detecting radiation from the examinee on a stretcher placed between guide rails by using a collimator and a line sensor which constitute a detection unit.

Abstract: Gamma rays obtained from radioisotope administered to an examinee are detected by a gamma ray information-detecting unit so that a first tomographic image obtained therefrom is formed on a CRT. Further, a second tomographic image of the examinee detected by using an ultrasonic wave information-detecting unit juxtaposed with respect to the gamma ray information-detecting unit is formed while making the second tomographic image overlap on the first tomographic image. Thus, it is possible to obtain a tomographic image in which relative positional relationship of tissue is clear.

Abstract: After the position of a collimator with respect to a gamma camera depending on the position of a detection plane in an examinee, gamma rays radiated from the examinee are detected by a scintillation detector via a collimator and a scintillator, and a signal from the scintillation detector is processed by a signal processing circuit and then transferred to an image reconstructing unit, which reconstructs a three-dimensional image of the radiation source in the examinee and displays the three-dimensional image on a display unit.

Abstract: A small-size gamma camera is capable of reliably and quickly detecting the accumulated position of a radiation source in an examinee. When the examinee is scanned with the gamma camera which has an area sensor comprising 256 (16×16) semiconductor detecting elements, display elements of a display unit on a rear panel of the gamma camera are turned on to display a pattern indicative of the accumulated position of the radiation source. According to the displayed pattern on the display elements, the operator of the gamma camera moves the gamma camera to detect the accumulated position of the radiation source reliably within a short period of time.

Abstract: It is intended to correctly determine the cerebral blood flow in a successful manner. When a constant &ggr; is determined in a relational expression of {Ka=&ggr;×(1−exp(−Ke/&ggr;))} provided that Ke represents an end-tidal air velocity constant and Ka represents an arterial blood velocity constant concerning a xenon CT examination, a K-S-calculating means determines a temporary calculated value &lgr;&agr; of a brain/blood distribution coefficient &lgr; from temporary calculated values Kai&agr;, Kao&agr; obtained by a Ke/Ka conversion means on the basis of an assumed value &ggr;&agr; of the Ke/Ka conversion constant &ggr; set by an assumed value-setting means. In this case, the assumed value-setting means varies the assumed value &ggr;&agr; within a desired range.

Abstract: In order to easily measure the hepatic arterial blood flow amount and the portal blood flow amount flowing through the liver, a mixed gas supply apparatus is used to supply a mixed gas of xenon gas and oxygen gas to the lung of a specimen for a certain period of time so that the change in xenon concentration in the tissue of the liver of the specimen is measured (detected) while making decomposition into picture elements by using an X-ray CT system. The hepatic arterial blood flow amount and the portal blood flow amount concerning the respective picture elements obtained by the decomposition are determined by using a computer on the basis of the fact that the xenon concentration in the liver tissue is determined by the xenon concentration in the hepatic arterial blood flow and the xenon concentration in the portal blood flow.