Noncontrast Computed Tomography Parameters for Predicting Shock Wave Lithotripsy Outcome in Upper Urinary Tract Stone Cases

Table 2

Measuring method of mean stone density in previous studies.

Reference	Year	Number of patients	Measuring method
			CT windows		ROI placement
			Abdominal	Bone	Elliptical ROI	Three ROIs
El-Nahas et al. [9]	2007	120		○	○
Perks et al. [19]	2007	76	N/A			○
Perks et al. [5]	2008	111		○	○	○
Kacker et al. [20]	2008	325		○	○
Bandi et al. [12]	2009	94	○		N/A
El-Gamal et al. [21]	2009	76		○	N/A
Wiesenthal et al. [8]	2010	422		○	○