Table 4.

Signal-to-noise ratio (SNR) and Contrast-to-noise ratio (CNR)

Parameters		AFSMRI	Conventional MRI	P value
Signal-to-noise ratio	Bone marrow	32.1±11.9(12.4–77.1)	11.2±5.1(3.3–33.7)	P<0.05
	Muscle	106.1±37.9(22.8–244.7)	54.4±17.7(21.8–121.6)
	Cartilage	197.6±77.2(66.8–434.9)	80.7±30.3(33.9–215.8)
	Fluid	375.3±146.9(98.9–752.9)	142.7±49.5(12–266.1)
Contrast-to-noise ratio	Bone marrow to fat pad	−15.1±15.3(−62–33.5)	−6.8±7.7(−27–12)	P<0.05
	Muscle to fat pad	58.7±28.8.3(−15.5–187.6)	36.3±15.3(−1–90.4)
	Cartilage to fat pad	150.3±70.5(24.6–382.6)	62.7±28.6(15.9–200.2)
	Fluid to fat pad	327.9±138.9(64.4–709.3)	124.7±46.9(1.4–240.6)
	Muscle to fluid	−269.1±129(−611.9–18.6)	−88.4±41(−185.9–35.8)
	Cartilage to fluid	−177.6±124.8(−498.6–155.6)	−62±38.6(−140–52)
	Bone marrow to cartilage	−165.6±71.9(−406.3–−26)	−69.5±29(−201.8–−26.3)

Data presented as mean ± standard deviation (with range in parenthesis);

SNR was calculated as the mean signal intensity (SI) of regions of interest divided by the standard deviation SI of the background(air);

CNR was calculated by using the formula: CNR = SNR₁ – SNR₂.