Method of detecting sensitivities of photomultipliers

Claim 1

A method of detecting and adjusting the sensitivities of a plurality of photomultipliers relative to one another in a radiation image recording and reproducing system employing a stimulable phosphor sheet carrying a radiation image stored therein, wherein the photomultipliers are arranged sequentially in a preliminary and a secondary stage, comprising the steps of; sequentially irradiating said photomultipliers to light emitted from the same light source, comparing the outputs of said photomultipliers generated under said irradiation, said stimulable phosphor sheet carrying a radiation image stored therein exposed to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the radiation energy stored therein, reading out the emitted light photoelectrically and converted it to an electric signal, reproducing the radiation image into a visible image based on the obtained electric signal; and wherein the plurality of said photomultipliers comprises a photomultipliers used for preliminary read-out for detecting in advance the image input information stored in said stimulable phosphor sheet, and a photomultiplier used for final read-out for obtaining said visible for viewing purposes.

Claim 2

A method of detecting and adjusting the sensitivities of a plurality of photomultipliers relative to one another in a radiation image recording and reproducing system employing a stimulable phosphor sheet carrying a radiation image stored therein, wherein the photomultipliers are arranged sequentially in a preliminary and a secondary stage, comprising the steps of; sequentially irradiating said photomultipliers to light emitted from the same light source, comparing the outputs of said photomultipliers generated under said irradiation, said stimulable phosphor sheet carrying a radiation image stored therein exposed to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the radiation energy stored therein, reading out the emitted light photoelectrically and converted it to an electric signal, reproducing the radiation image into a visible image based on the obtained electric signal; and wherein the plurality of said photomultipliers comprises a photomultipliers used for preliminary read-out for detecting in advance the image input information stored in said stimulable phosphor sheet, and a photomultiplier used for final read-out for obtaining said visible for viewing purposes.

Claim 6

A method of detecting and adjusting the sensitivities of photomultipliers relative to one another in a radiation image recording and reproduction system using a stimulable phosphor sheet carrying a radiation image stored therein; wherein the photomultipliers are arranged sequentially in a preliminary and a secondary stage comprising the steps of; sequentially irradiating said photomultipliers to light emitted from the same light source, comparing the outputs corresponding to said sensitivities of said photomultipliers generated under said irradiation, calculating the difference between the detected sensitivities relative to one another and predetermined sensitivities relative to one another, and correcting the sensitivities of the respective photomultipliers so that said difference becomes zero, said stimulable phosphor sheet carrying a radiation image stored therein exposed to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the radiation energy stored therein, reading out the emitted light photoelectrically and converting it to an electric signal, reproducing the radiation image into a visible image based on the obtained electric signal; and wherein the plurality of said photomultipliers comprises a photomultiplier used for preliminary read-out for detecting in advance the image input information stored in said stimulable phosphor sheet, and, a photomultiplier used for final read-out for obtaining said visible image for viewing purposes.

Claim 7

A method of detecting and adjusting the sensitivities of photomultipliers relative to one another in a radiation image recording and reproduction system using a stimulable phosphor sheet carrying a radiation image stored therein; wherein the photomultipliers are arranged sequentially in a preliminary and a secondary stage comprising the steps of; sequentially irradiating said photomultipliers to light emitted from the same light source, comparing the outputs corresponding to said sensitivities of said photomultipliers generated under said irradiation, calculating the difference between the detected sensitivities relative to one another and predetermined sensitivities relative to one another, and correcting the sensitivities of the respective photomultipliers so that said difference becomes zero, said stimulable phosphor sheet carrying a radiation image stored therein exposed to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the radiation energy stored therein, reading out the emitted light photoelectrically and converting it to an electric signal, reproducing the radiation image into a visible image based on the obtained electric signal; and wherein the plurality of said photomultipliers comprises a photomultiplier used for preliminary read-out for detecting in advance the image input information stored in said stimulable phosphor sheet, and, a photomultiplier used for final read-out for obtaining said visible image for viewing purposes.