Abstract: The present disclosure provides a gamma camera imaging method and a gamma camera imaging device. The method includes: selecting, from energy spectrums captured by a gamma camera on one or more radioactive materials, one or more energy ranges of each radioactive material among the one or more radioactive materials as one or more monitored energy regions of the radioactive material; performing image reconstruction on the monitored energy regions of each radioactive material among the one or more radioactive materials; performing normalization on images obtained through the image reconstruction; and performing superimposing on the normalized images to form a composite image.

Abstract: Communication methods, systems, servers, and client devices in a user-interactive system are provided herein. In an exemplary method, a communication interface can be started via a first user-interactive client by a first user to communicate with one or more communication tools via a communication backend server. The first user-interactive client can obtain and display a plurality of second user IDs of second users. The first user-interactive client can receive one or more second user IDs selected by the first user to add to a communication group. The first user-interactive client can send to the communication backend server a message for joining the communication group containing the one or more second user IDs. After receiving an accepting message from the communication backend server, during a user-interactive operation, the first user-interactive client can communicate with a second client corresponding to a user ID contained in the accepting message.

Abstract: Communication methods, systems, servers, and client devices in a user-interactive system are provided herein. In an exemplary method, a communication interface can be started via a first user-interactive client by a first user to communicate with one or more communication tools via a communication backend server. The first user-interactive client can obtain and display a plurality of second user IDs of second users. The first user-interactive client can receive one or more second user IDs selected by the first user to add to a communication group. The first user-interactive client can send to the communication backend server a message for joining the communication group containing the one or more second user IDs. After receiving an accepting message from the communication backend server, during a user-interactive operation, the first user-interactive client can communicate with a second client corresponding to a user ID contained in the accepting message.