信噪比（signal to noise ratio,SNR）是MRI最基本的质量参数，其正确的概念表述应为（）A、图像的亮度与暗度之比B、两个像素的信号强度之比C、两个体素的信号强度之比D、图像的信号强度与背景强度之比E、图像的信号与噪声之比
信噪比（signal to noise ratio,SNR）是MRI最基本的质量参数，其正确的概念表述应为（）
- A、图像的亮度与暗度之比
- B、两个像素的信号强度之比
- C、两个体素的信号强度之比
- D、图像的信号强度与背景强度之比
- E、图像的信号与噪声之比
相关考题：
According to Shannon's equation, what is the channel capacity of an analog voice-grade phone line with a bandwidth of 3100 Hz and a signal-to-noise ratio or 30 dB?A．9.1 KbpsB．9.3 KbpsC．30.9 KbpsD．30.17 Kbps
The maximum data rate of any single wireless link can be described by the shannons theorem which is related to the（）in hertz，and the（）on the channelA．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal
信噪比(signal to noise ratio,SNR)是MRI最基本的质量参数，其正确的概念表述应为：()。A、图像的亮度与暗度之比B、两个像素的信号强度之比C、两个体素的信号强度之比D、图像的信号强度与背景强度之比E、图像的T1值与背景噪声T1值之比
What is an advantage of an externally modulated laser over a directly modulated laser?() A. lower costB. higher chirpC. easier to manufactureD. higher dispersion toleranceE. higher optical signal-to-noise ratio
You are the Cisco Network Designer in Cisco.com. Which signal and noise values will result in the best phone communication with an access point?() A. signal strength 5dBmB. signal strength 6dBmC. noise level 4dBmD. noise level 5dBm
什么是RSRP?() A.The received power on the resource elements that carry cell-specific reference signalsB.wideband powerC.N times the Reference Signal Received Power divided by the total received power in the channel bandwidthD.Signal to Interference plus Noise Ratio
Which of these terms refers to call issues that cause variations in timing or time of arrival？（）A、queuingB、jitterC、packet lossD、digitized samplingE、signal-to-noise ratio ratio
In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）A、the signal to noise of the current optical amplifierB、the signal to noise of the previous amplifier or sourceC、the signal to noise introduced by the optical multiplexerD、the accumulated noise to signal ratio of the optical channel
What is an advantage of an externally modulated laser over a directly modulated laser?（）A、lower costB、higher chirpC、easier to manufactureD、higher dispersion toleranceE、higher optical signal-to-noise ratio
什么是RSRP？（）A、The received power on the resource elements that carry cell-specific reference signalsB、wideband powerC、N times the Reference Signal Received Power divided by the total received power in the channel bandwidthD、Signal to Interference plus Noise Ratio
Which signal and noise values will result in the best phone communication with an access point？（）A、 Signal strength 0dBm， noise level 6dBmB、 Signal strength 8dBm， noise level 9dBmC、 Signal strength 4 dBm， noise level 4 dBmD、 Signal strength 6dBm， noise level 5 dBm
As an experienced technician, you are responsible for Technical Support. A customer calls to ask the best signal level and noise level for cell phone. How to respond?（）A、-40dBm signal and -90dBm noiseB、-50dBm signal and -90dBm noiseC、-30dBm signal and -90dBm noiseD、-20dBm signal and -90dBm noise
Which signal and noise values will result in the best phone communication with an access point?（）A、signal strength 46dBm, noise level 95dBmB、signal strength 74dBm, noise level 94dBmC、signal strength 68dBm, noise level 79dBmD、signal strength 50dBm, noise level 56dBm
You are the Cisco Network Designer in Cisco.com. Which signal and noise values will result in thebest phone communication with an access point？（）A、 signal strength 5dBmB、 signal strength 6dBmC、 noise level 4dBmD、 noise level 5dBm
单选题What is an advantage of an externally modulated laser over a directly modulated laser?（）Alower costBhigher chirpCeasier to manufactureDhigher dispersion toleranceEhigher optical signal-to-noise ratio
单选题In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（）A the signal to noise of the current optical amplifierB the signal to noise of the previous amplifier or sourceC the signal to noise introduced by the optical multiplexerD the accumulated noise to signal ratio of the optical channel
单选题什么是RSRP？（）AThe received power on the resource elements that carry cell-specific reference signalsBwideband powerCN times the Reference Signal Received Power divided by the total received power in the channel bandwidthDSignal to Interference plus Noise Ratio
单选题Which of these terms refers to call issues that cause variations in timing or time of arrival？（）AqueuingBjitterCpacket lossDdigitized samplingEsignal-to-noise ratio ratio
单选题As an experienced technician， you are responsible for Technical Support. A customer calls to askthe best signal level and noise level for cell phone. How to respond？（）A -40dBm signal and -90dBm noiseB -50dBm signal and -90dBm noiseC -30dBm signal and -90dBm noiseD -20dBm signal and -90dBm noise
单选题In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）Athe signal to noise of the current optical amplifierBthe signal to noise of the previous amplifier or sourceCthe signal to noise introduced by the optical multiplexerDthe accumulated noise to signal ratio of the optical channel
单选题信噪比（signal to noise ratio,SNR）是MRI最基本的质量参数，其正确的概念表述应为（）A图像的亮度与暗度之比B两个像素的信号强度之比C两个体素的信号强度之比D图像的信号强度与背景强度之比E图像的信号与噪声之比
单选题What is an advantage of an externally modulated laser over a directly modulated laser？ （）A lower costB higher chirpC easier to manufactureD higher dispersion toleranceE higher optical signal-to-noise ratio