TRICKS Magnetic Resonance Angiography at 3-Tesla for Assessing Whole Lower Extremity Vascular Tree in Patients with High-Grade Critical Limb Ischemia: DSA and TASC II Guidelines Correlations

Table 1

Comparison of stenosis scores on T-MRA and DSA and depiction of significant stenosis in various segments of the lower extremity.

	Stenosis score			Depiction of significant stenosis
	T-MRA (mean ± SD)	DSA (mean ± SD)	κ *	T-MRA (𝑛)	DSA (𝑛)	Sen. %	Spe. %	PPV %	NPV %	Acc. %
Aortoiliac
Lower aorta	0.8±0.4	0.7±0.5	0.787	1	1	100	100	100	100	100
CIA	1.2±1.0	1.1±1.0	0.875	17	16	100	97.6	94.1	100	98.3
EIA	1.3±1.1	1.2±1.0	0.860	14	13	100	97.8	92.9	100	98.3
CFA	0.8±0.8	0.8±0.8	0.885	8	7	100	98.0	87.5	100	98.3
Femoral popliteal
USFA	2.2±1.2	2.1±1.2	0.887	41	40	100	94.4	97.6	100	98.3
LSFA	2.3±1.1	2.2±1.0	0.929	44	43	100	93.3	97.7	100	98.3
Popliteal	1.6±1.4	1.6±1.4	0.889	26	25	96.0	93.9	92.3	96.9	94.8
Infrapopliteal
UATA	2.7±1.2	2.6±1.2	0.857	44	43	100	93.3	97.7	100	98.3
LATA	2.8±1.2	2.8±1.2	0.902	49	48	100	90.0	98.0	100	98.3
UPTA	2.8±1.1	2.8±1.2	0.902	46	44	100	85.7	95.7	100	96.6
LPTA	2.8±1.3	2.7±1.3	0.906	45	44	100	92.9	97.8	100	98.3
UPe	2.4±1.2	2.3±1.1	0.840	41	40	100	94.4	97.6	100	98.3
LPe	2.5±1.1	2.5±1.2	0.862	44	41	100	82.4	93.2	100	94.8
Pedal**
DP	1.8±1.2	1.9±1.3	0.812	26	25**	96.0	93.9	92.3	96.9	94.8
PL	2.8±1.2	3.0±1.3	0.802	35	34**	100	95.8	97.1	100	98.3
Average	2.1±1.3	2.0±1.3	0.883	32.1	30.9	99.5	93.6	95.4	99.6	97.7

T-MRA: TRICKS-magnetic resonance angiography; DSA: digital subtraction angiography; (𝑛): number of patients with at least one significant stenosis; Sen.: sensitivity; Spe.: specificity; NPV: negative predictive value; PPV: positive predictive value; Acc.: accuracy; CIA: common iliac artery; EIA: external iliac artery, CFA: common femoral artery; USFA and LSFA: upper and lower superficial femoral artery; UATA and LATA: upper and lower anterior tibial artery; UPTA and LPTA: upper and lower posterior tibial artery, UPe and LPe: upper and lower peroneal artery; DP: dorsal pedis; PL: plantar artery
**Surgical findings was regarded as gold standard while there were discordance between T-MRA and DSA (4 DP and 2PL were not opacified on DSA but seemed patent on MRA with subsequent surgical confirmation of patency). *Stenosis scores (T-MRA versus DSA) were assessed with kappa statistics.