A Proposed Method to Quantify Vitreous Hemorrhage by Ultrasound

Figures & data

Figure 1 (A) Longitudinal, 3 o’clock scan of a left eye with vitreous hemorrhage (VH). Gain is set at initial standard of 90 dB. (B) Same scan with maximum gain at 110 dB. The visualization of vitreous details improves with more gain. (C) Minimum image gain (MIG) obtained at 58 dB, where there is a completely “echo-silent” vitreous cavity.

Table 1 Independent Samples t-Test for Group 1: VHs Vs Group 2: Controls

Groups	MIG (σ; Range)	95% CI	Independent Samples t-test
Group 1: VHs (n: 50)	52.8 dB (σ: 9.81; 36–83)	50.0–55.59	t: −12.698 Mean diff: −25.17 dB P<0.000
Group 2: Control (n: 34)	77.97 dB (σ: 7.34; 63–89)	75.39–80.54

Abbreviations: VHs, vitreous hemorrhages; MIG, minimum image gain; σ, standard deviation; 95% CI, ninety-five percent confidence intervals; Mean diff, mean difference between groups.

Table 2 Overall MIG Results, Segmented by Etiology of Vitreous Hemorrhage

Mean MIG Results for Graders 1 & 2
	Etiology	MIG	σ	Range
Mean MIG in VH (N: 113): 54.69 db σ: 10.52 Range: 36–85 db	PDR (n: 89)	55 dB	11	36-85 dB
	OT (n: 6)	53 dB	13	38-65 dB
	HPVD (n: 6)	59 dB	9	46-70 dB
	RVO (n: 5)	54 dB	9	47-69 dB
	SCH (n: 4)	45 dB	6	37-50 dB
	RMA (n: 2)	50 db	17	38-63 dB
	PO IOL Fix (n: 1)	58 db	-	-

Abbreviations: MIG, minimum image gain; VH, vitreous hemorrhage; dB, decibels; σ, standard deviation; PDR, proliferative diabetic retinopathy; OT, ocular trauma; HPVD, hemorrhagic posterior vitreous detachment; RMA, retinal macroaneurysm; SCH, suprachoroidal hemorrhage; CRVO, central retinal vein occlusion; PO IOL Fix, postoperative intraocular lens fixation.