Topic ID: id_16157798
Version: 1.0
Date: Jul 7, 2018 4:33:23 PM

X-Ray Gen Stats RTS data

This document defines the available Real Time Statistics (RTS) data available on the system for the Xray Gen subsystem. The RTS data is sent by the JEDI to the ORP to the TGP and then to the host at the end of each exam.

The RTS viewer for the Xray Gen Stats shows a listing of information related to the Xray generator subsystem. See Figure 1 for a pictorial view of the data to help in understanding the information seen.

Table 1. RTS data example
RTS (Real Time Statistics) Name	Data Example	Unit	Range	Explanation
Date: Wed Apr 7 08:12:51 2004				Date/Time for this data set
ENDEXAM: ID 801				Exam associated with this data set.
Spits::				Header for Spit data for this exam
Num_of_Spits_per_Exam:	0			Total number of spits for this series of exposures (the entire exam). Tube spit count will force a scan abort under the following two conditions: > 20 spits in a 100ms window, >32 spits in a 1s window
Rate_of_Spits_per_10secExp:	0			Average spits per 10 seconds during this exam. Tube spit count will force a scan abort under the following two conditions: > 20 spits in a 100ms window, >32 spits in a 1s window
Exposure::				Header for individual exposure data
Exp_Number:	1			Exposure number (An exam can consist of a series of exposures)
Select_kV:	120	Kv		Desired kV for this exposure
Select_mA:	80	mA		Desired mA for this exposure
Select_Exp_Duration:	4280	ms		Desired Exposure duration, in milliseconds
Select_Focus:	1	flag		Focal spot selection 1:small,2:large
Rx_Option:	0	flag		Prescription selection 0:normal,9:AutomA,12:EKGmodmA
Average_kV:	120	Kv
Average_mA:	80	mA
kV_at_5ms:	120.1999997	Kv		kV at 5 milliseconds in the exposure. There is no specification on this measurement and as such no scan aborts can occur based on it. This measurement is used in the filament calibration process to determine calibration success
mA_at_5ms:	78.599998	mA		mA at 5 milliseconds in the exposure. There is no specification on this measurement and as such no scan aborts can occur based on it. This measurement is used in the filament calibration process to determine calibration success
Actual_Exp_Duration:	4.080952	sec		Actual exposure duration, +/- 5%. Exposure time is the duration that actual kV is within 75% of the selected value.
Num_of_Spits_per_Exp:	0	count		Number of counted tube spits during this exposure. Tube spits are a characteristic of all functional x-ray tubes. However, mass quantities of tube spits are not.
Filament_Current_in_Preheat:	6214	mA		Current present in tube filament just before the exposure. Filament heated corresponds to the focal spot selection. Standby: 1.8 - 3 A (nominal) Normal Operation: 3.5 - 7.5 A (normal operating range) Boost Range: 10 A (Maximum)
Filament_Current_in_Exposure:	6265	mA		Current present in tube filament just before the exposure. Filament heated corresponds to the focal spot selection. Standby: 1.8 - 3 A (nominal) Normal Operation: 3.5 - 7.5 A (normal operating range) Boost Range: 10 A (Maximum)
HVDC_Bus_Voltage:	603	V		Bus voltage just before the exposure end
Rotor_PWM:	498	Volts DC_Bus		Voltage required to drive the x-ray tube anode. As friction is increased, more voltage is required at the stator to drive the anode. The minimum value for this is 480VDC.
Exposure::				Another exposure heading
Exp_Number:	2	count		Exposure number 2 statistics will follow. The data fields are the same as the previous exposure. Every exposure in the exam will appear in RTS, to a maximum of 300 exams.
Data repeats for all subsequent exposures in this exam