ABSTRACT
Breast cancer is one of the most common malignant tumors in women, and its morbidity is increasing gradually in recent years. Precision treatment has been developed with individualized and standardized protocols according to the molecular classification of breast cancer. Targeted therapy is one of the most important methods. How to evaluate targeted therapy is the focus of attention. PET/CT plays an im-portant role in the diagnosis, staging, treatment plan and evaluation of therapeutic effect and prognosis, es-pecially in targeted therapy of breast cancer. This review summarizes the applications of PET/CT in targeted therapy of breast cancer.
ABSTRACT
Breast cancer is one of the most common malignant tumors in women, and its morbidity is increasing gradually in recent years. Precision treatment has been developed with individualized and standardized protocols according to the molecular classification of breast cancer. Targeted therapy is one of the most important methods. How to evaluate targeted therapy is the focus of attention. PET/CT plays an im-portant role in the diagnosis, staging, treatment plan and evaluation of therapeutic effect and prognosis, es-pecially in targeted therapy of breast cancer. This review summarizes the applications of PET/CT in targeted therapy of breast cancer.
ABSTRACT
Objective:To find out whether it is accurate to estimate femoral version based on femoral broach after femoral neck osteotomy using computed tomography scans.Methods:In 32 total hip arthro-plasty (THA),we performed CT scans before and after operation.Four possible levels (lesser trochan-ter,5 mm above,10 mm above and 15 mm above the lesser trochanter)of broach version were calculated based on the pre-operative CT scan.Stem versions were measured on the post-operative CT scan.We de-termined the difference between the preoperative broach version and the postoperative stem version using the Student’s t-test for paired samples assuming equal variance.Results:For the operated hips,pre-operative hip version differed according to the level of measurement.Our findings showed that the average femoral version was 37.0°±11.0°at the level of the lesser trochanter (section 1),34.3°±10.6°at 5 mm above the lesser trochanter (section 2),28.1°±10.9°at 10 mm above the lesser trochanter (sec-tion 3),and 22.4°±13.7°at 15 mm above the lesser trochanter (section 4),and that the average ver-sion for the femoral neck (FNV)was 12.9°±13.8°.The postoperative hip version was the stem version (FSV),which we found to be an average of 26.1°±11.0°.The mean femoral version for section 1 and 2 was larger than the mean postoperative stem version (P0.05).The mean femoral neck version was less than the mean postoperative stem version (P<0.01);the difference was 13.2°±11.1°of the in-creased anteversion on average for the FSV compared with FNV.Conclusion:The accuracy of estimated femoral version after arthroplasty depends on broach level.When it is 10 mm above the lesser trochanter, stem version estimation is accurate,but below that level,there is a tendency to overestimate.
ABSTRACT
Objective To define individualized internal target volume (ITV) for hepatocellular car-cinoma using four-dimensional (4D) CT, and to compare the differences in target volume definition and dose distribution among 3D, 4D and respiratory-gated plans. Methods 4DCT scanning was obtained for 12 pa-tients with hepatoceUular. Gross tumor volume (GTV), clnical target volume (CTV) and normal tissues were contoured on all 10 respiratory phases of 4DCT images. The 3D, 4D and gated treatment plans were prepared for each patient using three different planning target volumes (PTVs): 1) PTV3D was derived from a single CTV plus conventional margins;2) PTV4D was derived from ITV4D, which encompassed all 10 CTVs plus setup margins (SMs);3) PTV_(Gating) was derived from ITV_(Gating), which encompassed 3 CTVs within ga-ting-window at end-expiration plus SMs. The PTV volume and dose distribution were compared among differ-ent plans. Results The PTV3D was the largest in all 12 patients, but still missed partial target volume in 5 patients when comparing with PTV4D. Both the 4D plans and the gated plans spared more normal tissues than the 3D plans, especially the hver. Without increasing normal tissue dose, the 4D plans allowed for increas-ing the calculated dose from (50.8±2.0) Gy (3D plans) to (54.7±3.3) Gy, and the gated plans could further increase the dose to (58.0±3.9) Gy. Conclusions The 4DCT-based plans can ensure optimal tar-get coverage with less irradiation of normal tissues and allow dose escalation when compared with 3D plans.Respiratory gated radiotherapy can further reduce the target volumes to spare more surrounding tissues, espe-cially for patients with large extent of respiratory mobility.
ABSTRACT
OBJECTIVE To analyze the incidence of the bifurcation of the facial nerve in mastoid segment and to give the anatomic information for mastoid surgery. METHODS From March 2005 to April 2006, there were 112 patients undergoing the decompress operations which the range included the mastoid segment. The bifurcation of the mastoid segment was recorded and compared with the preoperational High-resolution Computed tomography (HRCT) scans. RESULTS There were 5 cases with the nerve bifurcation. The incidence was 4.5 %. Four of those 5 cases were diagnosed preoperatively by HRCT scans (the accurate rate was 80 %). CONCLUSION Bifurcation of the mastoid segment was not rare. Otologic surgeon should pay attention to this anatomic variation to avoid injuring the branch of the facial nerve. HRCT scans were useful to find this abnormality.