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目的：比较分析Ｘ线平片、ＣＴ、发射计算体层摄影（ＥＣＴ）诊断骨转移瘤。材料与方法：５０例骨转移瘤均经手术病理证实，所有病例均先后作了Ｘ线摄影， ＣＴ及ＥＣＴ全身骨扫描。所用仪器为东芝５００ｍＡ Ｘ线机，东芝Ｌ３０００ ＣＴ扫描机及法国Ｓｏｐｈａ公司ＳＤＸ型发射计算体层摄影仪。结果：诊断转移性骨肿瘤灵敏度： ＥＣＴ（９７．２％）高于ＣＴ（６９．７％）、Ｘ线平片（５８．３％）；精确度： ＥＣＴ（８８．０％）亦高于ＣＴ（７８．０％）、Ｘ线平片（６８．０％）；假阴性率： ＥＣＴ比Ｘ线平片、ＣＴ均低的多；特异性：ＥＣＴ（６４．３％）明显低于ＣＴ（９４．１％）及Ｘ线平片（９２． ９％）；假阳性率：ＥＣＴ均比ＣＴ及Ｘ线平片高。ＥＣＴ的阴性预测值较高，而Ｘ线平片及ＣＴ扫描的阳性预测值较高。结论：ＥＣＴ能更早显示出病灶，是骨转移瘤较好的筛选方法。Ｘ线平片、ＣＴ检查特异性较强是骨转移瘤最基本的检查方法，三种方法具有互补作用。
Objective: To compare X-ray plain film, CT, and computed tomography (ECT) in the diagnosis of bone metastases. Materials and Methods: All 50 cases of bone metastases were confirmed by operation and pathology. X-ray photographs, CT and ECT bone scans were performed in all cases. The instruments used were a Toshiba 500mA X-ray machine, a Toshiba L3000 CT scanner, and a French Sopha SDX-type emission computed tomography camera. Results: Sensitivity of metastatic bone tumor diagnosis: ECT (97.2%) was higher than CT (69.7%), plain radiograph (58.3%); accuracy: ECT (88.0%) was also higher than CT (78.0%), X-ray plain film (68.0%); false-negative rate: ECT was much lower than plain film and CT; specificity: ECT (64.3%) was significantly lower than CT (94.1%) and X-ray plain film (92.9%); false positive rate: ECT is higher than CT and X-ray plain film. The negative predictive value of ECT is higher, and the positive predictive value of X-ray and CT scan is higher. Conclusion: ECT can show lesions earlier and is a better screening method for bone metastases. X-ray plain film and CT examination of specificity is the most basic examination method of bone metastases, and the three methods have complementary effects.