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ECR 2011 / C-1439
Evaluation of meniscal lesions with high field (1.5 T) and new concept dedicated (0.31 T) MR systems: imaging findings and correlation with arthroscopy
Congress: ECR 2011
Poster No.: C-1439
Type: Scientific Exhibit
Keywords: Motility, Athletic injuries, Acute, Surgery, Imaging sequences, Diagnostic procedure, MR, Musculoskeletal system, Musculoskeletal joint, Extremities
Authors: A. Paolicchi, V. Zampa, F. Ruschi, M. Barattini, F. Paolicchi, I. Castellini, L. Andreani, M. Lisanti, C. Bartolozzi; Pisa/IT
DOI:10.1594/ecr2011/C-1439

Methods and Materials

Fifteen patients underwent MR examinations with both the dedicated MR scanner and the high field system between October and December 2010.

Inclusion criteria were: age between 18 and 60 years, clinical suspicion of meniscal lesion, no history of surgery on the affected knee.

 

 

Table 1: dedicated 0.31 T MR system: technical details

SMF Intensity

0,3 T ± 4 mT

 

Gantry opening

Height: 34 cm

Width: 18 cm

 

Dual-Phased Array receiving coils

Knee:[15*10*14]cm [W*D*H]

Ankle/Elbow:[28*15*19]cm

Hand/ Wrist: [20*7*12]cm

 

Patient seat: maximum weight

150 Kg

 

Overall dimension of installation site

[2.8*3.2]m

 

Power consumption (continous)

Lower than 1 kW

 

 

 

Sequences used with both systems were: SE T1, FSE DP, STIR in the sagittal plane; X BONE (0.31 T) and GE T2 fat sat (1.5 T) in the coronal plane.

 

 

Table 2: MR scanning protocols

1.5 T

THICKNESS

GAP

FOV

TE

TR

SE T1 SAG

4

0.8

150

12

450

STIR SAG

3.5

0.7

180

35

3830

FSE DP SAG

4

0.8

150

14

3080

GE T2 fat sat COR

4

0.4

190

23

1930

O.31 T

 

 

 

 

 

SE T1 SAG

4

0.4

140

20

720

STIR SAG

4

0.4

140

24

2000

FSE DP SAG

4

0.4

140

20

2000

X BONE T2 COR

4

0.4

140

11, 22

900

 

 

The exams performed with the dedicated MR system took about 16 minutes; when operating with the high-field MR system the examinations took about 13 minutes.

A few days after the MR exams, all patients underwent arthroscopy, that was taken as the gold standard concerning presence or absence of meniscal lesions.

 

Two expert radiologists performed a double-blind reading, using the same monitor (Advantage Workstation GE, Milwakee, USA) in order to reduce bias related to monitor's resolution.

 

For each meniscus anterior and posterior horns were considered, with the following scores: 0, absence of lesion; 1, uncertain interpretation; 2a, degenerative lesion; 2b, complete fracture and/or parameniscal cyst and/or bucket handle lesion.

 

 

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