Purpose: This study aimed to examine whether the signal-to-noise ratio (SNR) could be increased by combining integrated slice-by-slice shimming (iShim) with a fat suppression (FS) method other than short-tau inversion...Purpose: This study aimed to examine whether the signal-to-noise ratio (SNR) could be increased by combining integrated slice-by-slice shimming (iShim) with a fat suppression (FS) method other than short-tau inversion recovery (STIR) in diffusion-weighted imaging (DWI) and q-space imaging (qsi). Methods: We acquired DWI images (b-values: 0 and nine steps from 400 to 10,000 s/mm2 for six axes) using a prototypical single-shot echo planar imaging sequence by combining two types of shimming (3D Shim and iShim) and two types of FS (STIR and water excitation [WE]) in 10 volunteers. In the DWI study, the SNR for each b-value, FS effect in the b0 image, and distortion in the added image (b0 - b10,000) were evaluated for the above-mentioned four imaging methods. qsi involved original DWI images. In the qsi study, the SNR was evaluated. Results: With regard to both 3D Shim and iShim, the SNRs were significantly higher when using WE than when using STIR in b0 - b900 images (p Conclusion: The combination of iShim and WE has a high SNR on qsi.展开更多
背景与目的:背景抑制扩散加权成像(diffusion-weighted whole-body imaging with background body signal suppression,DWIBS)是一种可用于全身检查的MR成像技术,可以较好地显示淋巴结及骨骼系统病变,其成像效果与PET类似。本研究旨在探...背景与目的:背景抑制扩散加权成像(diffusion-weighted whole-body imaging with background body signal suppression,DWIBS)是一种可用于全身检查的MR成像技术,可以较好地显示淋巴结及骨骼系统病变,其成像效果与PET类似。本研究旨在探讨DWIBS与核素骨扫描成像在骨转移性病变诊断中的临床应用价值。方法:36例经手术或穿刺病理证实为恶性肿瘤的患者行DWIBS及核素骨扫描检查,比较两者检出骨转移的情况,采用χ2检验,P<0.05为差异有统计学意义。结果:36例恶性肿瘤患者中,30例(共165处)发生骨转移,其中DWIBS检出26例(143处),核素骨扫描检出23例(132处),两者在检出骨转移方面差异无统计学意义(χ2=1.002,P=0.506)。DWIBS及核素骨扫描诊断骨转移的灵敏度、阳性预测值、准确度较为接近,分别为86.7%、96.3%、86.1%和76.7%、88.5%、72.2%;DWIBS诊断骨转移的特异度、阴性预测值高于核素骨扫描,分别为83.3%、55.6%和50.0%、30.0%。分析DWIBS和核素骨扫描检出骨转移的部位,两者的检出率分别为86.7%(143/165)、80.0%(132/165),差异无统计学意义(χ2=2.640,P=0.104);但DWIBS在检出骨盆及四肢长骨转移方面优于核素骨扫描,且两者差异均有统计学意义(χ2=6.783和7.636,P=0.023和0.016)。结论:运用DWIBS扫描技术可有效检出骨转移性病灶,且与核素骨扫描具有较好的一致性,有望在临床上推广应用。展开更多
背景与目的:抑制扩散加权成像(diffusion-weighted whole-body imaging with background body signal suppression,DWIBS),是一种可用于全身检查的核磁共振成像技术,尤其可以较好的显示转移病灶、淋巴结及骨骼系统病变。该文旨在评价DW...背景与目的:抑制扩散加权成像(diffusion-weighted whole-body imaging with background body signal suppression,DWIBS),是一种可用于全身检查的核磁共振成像技术,尤其可以较好的显示转移病灶、淋巴结及骨骼系统病变。该文旨在评价DWIBS与正电子发射计算机体层摄影(positron emission tomography with computed tomography,PET/CT)在恶性肿瘤转移性病变中的临床应用价值。方法:对36例手术或穿刺病理证实为恶性肿瘤且有转移的患者行DWIBS扫描,并与PET/CT结果相对照,统计学采用χ2检验、Kappa一致性检验比较分析。结果:36例恶性肿瘤患者共有238个转移性病灶,其中DWIBS检出218个(91.6%,218/238),PET/CT检出209个(87.8%,209/238),且DWIBS和PET/CT同时检出200个转移性病灶,两者的一致率为88.7%(211/238),但两种检查在检出转移病灶数目方面差异无统计学意义(χ2=1.843,P=0.157);Kappa检验两种检查的一致性程度尚可(P=0.000)。DWIBS和PET/CT在检出脑及骨转移方面差异均有统计学意义(P=0.005和0.031),但在检出淋巴结及肝脏转移方面差异均无统计学意义(P=0.309和1.000)。结论:DWIBS扫描技术可有效检出恶性肿瘤转移性病灶。与PET/CT相比,差异无统计学意义(P>0.05)。DWIBS检出脑、骨转移较PET/CT敏感,临床工作中可根据原发肿瘤特点,有针对性的选择DWIBS作为筛查转移病灶的方法之一。展开更多
文摘Purpose: This study aimed to examine whether the signal-to-noise ratio (SNR) could be increased by combining integrated slice-by-slice shimming (iShim) with a fat suppression (FS) method other than short-tau inversion recovery (STIR) in diffusion-weighted imaging (DWI) and q-space imaging (qsi). Methods: We acquired DWI images (b-values: 0 and nine steps from 400 to 10,000 s/mm2 for six axes) using a prototypical single-shot echo planar imaging sequence by combining two types of shimming (3D Shim and iShim) and two types of FS (STIR and water excitation [WE]) in 10 volunteers. In the DWI study, the SNR for each b-value, FS effect in the b0 image, and distortion in the added image (b0 - b10,000) were evaluated for the above-mentioned four imaging methods. qsi involved original DWI images. In the qsi study, the SNR was evaluated. Results: With regard to both 3D Shim and iShim, the SNRs were significantly higher when using WE than when using STIR in b0 - b900 images (p Conclusion: The combination of iShim and WE has a high SNR on qsi.
文摘背景与目的:背景抑制扩散加权成像(diffusion-weighted whole-body imaging with background body signal suppression,DWIBS)是一种可用于全身检查的MR成像技术,可以较好地显示淋巴结及骨骼系统病变,其成像效果与PET类似。本研究旨在探讨DWIBS与核素骨扫描成像在骨转移性病变诊断中的临床应用价值。方法:36例经手术或穿刺病理证实为恶性肿瘤的患者行DWIBS及核素骨扫描检查,比较两者检出骨转移的情况,采用χ2检验,P<0.05为差异有统计学意义。结果:36例恶性肿瘤患者中,30例(共165处)发生骨转移,其中DWIBS检出26例(143处),核素骨扫描检出23例(132处),两者在检出骨转移方面差异无统计学意义(χ2=1.002,P=0.506)。DWIBS及核素骨扫描诊断骨转移的灵敏度、阳性预测值、准确度较为接近,分别为86.7%、96.3%、86.1%和76.7%、88.5%、72.2%;DWIBS诊断骨转移的特异度、阴性预测值高于核素骨扫描,分别为83.3%、55.6%和50.0%、30.0%。分析DWIBS和核素骨扫描检出骨转移的部位,两者的检出率分别为86.7%(143/165)、80.0%(132/165),差异无统计学意义(χ2=2.640,P=0.104);但DWIBS在检出骨盆及四肢长骨转移方面优于核素骨扫描,且两者差异均有统计学意义(χ2=6.783和7.636,P=0.023和0.016)。结论:运用DWIBS扫描技术可有效检出骨转移性病灶,且与核素骨扫描具有较好的一致性,有望在临床上推广应用。
文摘背景与目的:抑制扩散加权成像(diffusion-weighted whole-body imaging with background body signal suppression,DWIBS),是一种可用于全身检查的核磁共振成像技术,尤其可以较好的显示转移病灶、淋巴结及骨骼系统病变。该文旨在评价DWIBS与正电子发射计算机体层摄影(positron emission tomography with computed tomography,PET/CT)在恶性肿瘤转移性病变中的临床应用价值。方法:对36例手术或穿刺病理证实为恶性肿瘤且有转移的患者行DWIBS扫描,并与PET/CT结果相对照,统计学采用χ2检验、Kappa一致性检验比较分析。结果:36例恶性肿瘤患者共有238个转移性病灶,其中DWIBS检出218个(91.6%,218/238),PET/CT检出209个(87.8%,209/238),且DWIBS和PET/CT同时检出200个转移性病灶,两者的一致率为88.7%(211/238),但两种检查在检出转移病灶数目方面差异无统计学意义(χ2=1.843,P=0.157);Kappa检验两种检查的一致性程度尚可(P=0.000)。DWIBS和PET/CT在检出脑及骨转移方面差异均有统计学意义(P=0.005和0.031),但在检出淋巴结及肝脏转移方面差异均无统计学意义(P=0.309和1.000)。结论:DWIBS扫描技术可有效检出恶性肿瘤转移性病灶。与PET/CT相比,差异无统计学意义(P>0.05)。DWIBS检出脑、骨转移较PET/CT敏感,临床工作中可根据原发肿瘤特点,有针对性的选择DWIBS作为筛查转移病灶的方法之一。
