TY - JOUR
T1 - Metal artifacts of hip arthroplasty implants at 1.5-T and 3.0-T
T2 - a closer look into the B1 effects
AU - Khodarahmi Qahnavieh, Iman
AU - Kirsch, John
AU - Chang, Gregory
AU - Fritz, Jan
PY - 2020
Y1 - 2020
N2 - Objective: To evaluate the effect of circular polarization (CP) and elliptical polarization (EP) of the B1 field on metal implant-induced artifacts of titanium (Ti) and cobalt-chromium (CoCr) hip arthroplasty implants at 1.5-T and 3.0-T field strengths. Material and methods: In vitro Ti and CoCr total hip arthroplasty implants were evaluated using high transmit and receive bandwidth turbo spin echo (HBW-TSE) and slice encoding for metal artifact correction (SEMAC) metal artifact reduction techniques. Each technique was implemented at 1.5-T, which only allows for CP of B1 field as the system default, as well as 3.0-T, which permitted CP and EP. Manual segmentation quantified the size of the metal artifacts at the level of the acetabular cup, femoral neck, and femoral shaft. Results: In the acetabular cup and femoral neck, 1.5-T CP achieved smaller artifact sizes than 3.0-T CP (28–29% on HBW-TSE, p = 0.002–0.005; 17–34% on SEMAC, p = 0.019–0.102) and 3.0-T EP (25–28% on HBW-TSE, p = 0.010–0.011; 14–36% on SEMAC, p = 0.058–0.135) techniques. In the femoral stem region, 3.0-T EP achieved more efficient artifact suppression than 3.0-T CP (HBW-TSE 44–45%, p < 0.001–0.022; SEMAC 76–104%, p < 0.001–0.022) and 1.5-T CP (HBW-TSE 76–96%, p < 0.001–0.003; SEMAC 138–173%, p = 0.003–0.005) techniques. Conclusion: Despite slightly superior metal reduction ability of the 1.5-T in the region of the acetabular cup and prosthesis neck, 3.0-T MRI of hip arthroplasty implants using elliptically polarized RF pulses may overall be more effective in reducing metal artifacts than the current standard 1.5-T MRI techniques, which by default implements circularly polarized RF pulses.
AB - Objective: To evaluate the effect of circular polarization (CP) and elliptical polarization (EP) of the B1 field on metal implant-induced artifacts of titanium (Ti) and cobalt-chromium (CoCr) hip arthroplasty implants at 1.5-T and 3.0-T field strengths. Material and methods: In vitro Ti and CoCr total hip arthroplasty implants were evaluated using high transmit and receive bandwidth turbo spin echo (HBW-TSE) and slice encoding for metal artifact correction (SEMAC) metal artifact reduction techniques. Each technique was implemented at 1.5-T, which only allows for CP of B1 field as the system default, as well as 3.0-T, which permitted CP and EP. Manual segmentation quantified the size of the metal artifacts at the level of the acetabular cup, femoral neck, and femoral shaft. Results: In the acetabular cup and femoral neck, 1.5-T CP achieved smaller artifact sizes than 3.0-T CP (28–29% on HBW-TSE, p = 0.002–0.005; 17–34% on SEMAC, p = 0.019–0.102) and 3.0-T EP (25–28% on HBW-TSE, p = 0.010–0.011; 14–36% on SEMAC, p = 0.058–0.135) techniques. In the femoral stem region, 3.0-T EP achieved more efficient artifact suppression than 3.0-T CP (HBW-TSE 44–45%, p < 0.001–0.022; SEMAC 76–104%, p < 0.001–0.022) and 1.5-T CP (HBW-TSE 76–96%, p < 0.001–0.003; SEMAC 138–173%, p = 0.003–0.005) techniques. Conclusion: Despite slightly superior metal reduction ability of the 1.5-T in the region of the acetabular cup and prosthesis neck, 3.0-T MRI of hip arthroplasty implants using elliptically polarized RF pulses may overall be more effective in reducing metal artifacts than the current standard 1.5-T MRI techniques, which by default implements circularly polarized RF pulses.
KW - 3.0-T
KW - Hip arthroplasty
KW - Metal artifact
KW - MRI
KW - Polarization
KW - Radiofrequency pulse
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U2 - 10.1007/s00256-020-03597-4
DO - 10.1007/s00256-020-03597-4
M3 - Article
C2 - 32918566
AN - SCOPUS:85090841440
JO - Skeletal Radiology
JF - Skeletal Radiology
SN - 0364-2348
ER -