BioMed Research International / 2018 / Article / Tab 2

Research Article

Image Quality and Patient-Specific Organ Doses in Stone Protocol CT: A Comparison of Traditional CT to Low Dose CT with Iterative Reconstruction

Table 2

CT stone, noise, and quality characteristics between modalities.

FBP-CTIR-CTp value
(n=250)(n=90)

+ Kidney Stone (%)221(88)80(89)p = 0.9
Mean stone diameter, mm (SD)5.8(1.3)5.1(1.1)p = 0.3

Kidney Stone Morphology (%)p = 0.75
Single192(87)73(91)
Confluence16(7)4(5)
Partial staghorn3(1)1(1)
Full staghorn10(5)2(3)

+ Ureteral Stone (%)53(22)28(31)p = 0.07
Mean stone diameter, mm (SD)4.7(1.0)4.3(0.9)p = 0.4

+ Hydronephrosis (%)48(22)24(30)p = 0.14

+ Bladder Stone (%)13(5)7(8)p = 0.37
Mean stone diameter, mm (SD)8.5 (2)3.5(0.8)p = 0.09

Noise† (%)p = 0.23
Minimal188(75)61(68)
Diagnostic60(24)29(32)
Excessive2(1)0(0)

Quality† (%)p = 0.39
Excellent141(56)42(47)
Good78(31)34(38)
Acceptable29(12)13(14)
Suboptimal1(1)1(1)
Poor/Non-diagnostic1(1)0(0)

Key: CT, computed tomography; FBP, filtered back projection; IR, iterative reconstruction.
SD, standard deviation; : 16 patients had kidney and one other stone location; † = interrater reliability (AC2) was high: AC2 for noise was 0.79, and AC2 for quality was 0.87.

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