摘要:

Having read, with considerable interest, the article in National Geographic, May 1991, entitled “Elephants—Out of Time, Out of Space”, I believe that the author Douglas Chadwick may have unwittingly explained a modern mystery (Chardwick, 1991).

DOI:10.1259/0007-1285-65-778-B91

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractThe diagnostic imaging appearances of three choroidal osteomas (osseous choristomas) are presented. This rare, benign choroidal tumour is being recognized with increasing frequency, and is important to remember in the differential diagnosis of any unusual mass in the ocular fundus lest it be mistaken for a more sinister lesion. All three osteomas were demonstrated by ocular ultrasound (US), fluorescein angiography (FA) and computed tomography (CT) but none by plain radiography. None of the lesions was visible on magnetic resonance imaging (MRI); the reason for this is probably the bony nature of the tumours. The appearances of choroidal osteomas on US, FA, plain radiography and CT are discussed. To our knowledge this is the first report of a series of choroidal osteomas investigated by MR.

DOI:10.1259/0007-1285-65-778-845

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractA retrospective review of hysterosalpingography (HSG) in a major gynaecological centre was carried out. 324 patients attended (95%) for HSG out of 341 patients referred for this investigation. 189 examinations (58.3%) were abnormal. The requests and radiological findings were reviewed and the results compared with laparoscopy. HSG remains an integral part of gynaecological investigation and its value has not diminished in modern practice.

DOI:10.1259/0007-1285-65-778-849

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractA prospective study was performed comparing computed and conventional radiography for the detection and visibility of cardiovascular devices in intensive care unit patients. Computed images were obtained using a commercially available 2K × 2K, 12-bit storage phosphor plate system. Image sets from 50 patients were assessed independently by three observers. A significant difference between the types of image was found for the detection of mediastinal drainage tubes and prosthetic valves. Computed images allowed greater confidence in the identification of courses and tips of lines. This advantage was most marked with edgeenhanced computed images.

DOI:10.1259/0007-1285-65-778-852

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractThe diagnostic accuracy of Doppler ultrasound in the detection of renal arterial disease has been assessed in a prospective study of 61 hypertensive patients. The findings of Doppler ultrasound were compared with the results of renal angiography. In 15 patients (24.5%) no accurate Doppler signs could be obtained and the Doppler ultrasound examination was considered a technical failure. Of the remaining 46 patients, 24 had renal artery stenosis. Nine of the stenoses were not detected by Doppler ultrasound and in three patients a false positive diagnosis of renal artery stenosis was made. The sensitivity of Doppler ultrasound was 62.5%, the specificity 86.4% and the overall diagnostic acccuracy was 73.9%. By comparing the 15 patients in whom Doppler ultrasound failed with the 46 in whom it was successful, age appeared to be higher and creatinine clearance lower in the failure group. By comparing the 34 patients with true positive and true negative results with the 12 patients with false results, no significant differences were found. In a multivariate analysis, higher age showed a significant relation to failure of Doppler ultrasound. Doppler ultrasound has limited value in the screening of hypertensive patients for renal artery stenosis.

DOI:10.1259/0007-1285-65-778-857

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractBone scintigraphy is the most sensitive imaging technique for the initial detection of bone metastases and is widely used in the staging of prostatic cancer. This study was performed to assess whether the development of further bone metastases can be detected by serial measurements of the serum glycoprotein prostate-specific antigen (PSA) as an alternative to follow-up scintigraphy. The bone scintigrams and PSA levels of 101 patients with metastatic prostate cancer entered into two therapeutic trials have been reviewed. Serial results of both investigations were available in 59 cases. In three cases new bone deposits were observed without a corresponding rise in PSA. In two other cases the scintigrams were considered to be suspicious of progression with no change in PSA levels; however, further follow-up indicated that these changes were not due to metastases. In 13 cases PSA levels were rising in advance of new deposits on the scintigrams. In the remaining 41 cases the PSA levels and scintigraphic findings paralleled each other. We conclude that serial estimation of PSA levels is a simpler marker for disease progression than bone scintigraphy in metastatic prostatic cancer, but that neither technique in isolation gives complete accuracy.

DOI:10.1259/0007-1285-65-778-861

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractLocalized loss of the aortic interface may occur as a normal variant or may be due to an adjacent mass or opacification. The former category is divided into four types depending on position and length of loss of interface. The findings on conventional chest radiographs are correlated with computed tomographic findings.

DOI:10.1259/0007-1285-65-778-865

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractPelvic phleboliths are familiar structures to radiologists although their pathogenesis is not fully understood. The literature suggests a relationship between the prevalence of phleboliths and diverticular disease, and with a low-fibre diet. Phleboliths are said to be seen more frequently in women and on the left side in the pelvis. Their number seems to increase with advancing age. We have attempted to establish relations of phleboliths with diverticulitis, diverticulosis, sex, age and pelvic location. In this study the only statistically significant relation was an increase of the number of phleboliths with advancing age.

DOI:10.1259/0007-1285-65-778-868

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractThe pre-operative radiological assessment of proximal bile duct tumours is clinically important as resection may be limited by tumour extension along the bile ducts, into hepatic parenchyma or the adjacent vascular structures. Demonstration of the extent of biliary and vascular involvement can direct additional investigations and definitive treatment. 22 patients with hilar cholangiocarcinoma were studied pre-operatively by conventional ultrasound (US) and duplex sonography (DS). The extent of tumour infiltration and vascular involvement was compared with arteriography and operative findings. Bile duct dilatation and the level of obstruction was documented by US in 22 (100%), and the tumour was shown by US in 19 (86%). In these 19 patients, the extent of extraductal extension compared with operative findings was correct in 13, underestimated in two, and in four infiltration was massed. Vascular patency or involvement was correctly determined by DS in 19 (86%), and by arteriography in 18 (82%). In two of the three incorrect DS interpretations, lobar atrophy and contralateral hypertrophy distorted the hilar anatomy. US with DS is valuable in the pre-operative staging of proximal bile duct tumours in predicting ductal and vascular involvement.

DOI:10.1259/0007-1285-65-778-871

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY

摘要:

AbstractA dimensionless figure of merit (F), which combines key aspects of the performance of image intensifier systems, is derived. This figure is ideally independent of input air kerma rate and field size and relates to the fundamental characteristics of the image reception chain. In practice it is calculated from measurements of the threshold contrast (noise) and limiting resolution using the Leeds test objects and the input air kerma rate. Several practical examples illustrate its usefulness in simple performance assessment and quality assurance procedures. A comparison is made with the use of detection index diagrams.

DOI:10.1259/0007-1285-65-778-878

出版商:The British Institute of Radiology    

年代:1992

数据来源: WILEY