摘要:

AbstractUnder standard conditions double contrast barium enema (DCBE) was carried out on a selected patient cohort using either standard (1.5 mA) or low (0.5 mA) fluoroscopic current. A statistically significant (p≤0.01) reduction in total dose was achieved by use of low screening current. This reduction was of the order of 40%. Fluoroscopic image quality was analysed both objectively and subjectively, and was found not to be significantly degraded when the lower current was used. On blinded evaluation all examinations were found to be of diagnostic quality. The use of low fluoroscopic current results in a reduction in patient dose, without compromising fluoroscopic image quality or diagnostic standard of the examination. Low fluoroscopic current technique has been adopted as the standard in our department.

DOI:10.1259/0007-1285-69-825-852

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractThe output video signal from three X-ray fluoroscopy machines was recorded with a storage oscilloscope to calculate the dynamic range of their image intensifier television camera chains. The two MERATE MTH90 and MGR50hf machines employed the same imaging chain but the response of the former to exposure was significantly lower because of a three channel light distribution optical system which was installed but not used. The CGR Stenoscope machine was found to have a very narrow dynamic range to the extent that it was not usable. Additional measurements on the CGR machine showed that the image intensifier brightness control mechanism would produce stabilized brightness in less than 0.4s and it proved to be faster than the manual selection of exposure parameters. The quality of the image stored in the memory device on the same system was compared with the original by subtracting the two video signals on the oscilloscope and thus acquiring a quantitative measure of their difference.

DOI:10.1259/0007-1285-69-825-855

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractRadiation exposure of cardiac catheterization laboratory staff is a known occupational hazard, and efforts are made to obtain dose levels which are “as low as reasonably achievable”. This study assessed the reduction in staff radiation exposure using cine framing at 12.5 f s−1during coronary cineangiography, instead of 25 f s−1. Thermoluminescent dosemeters were used to measure equivalent dose at several sites for the operator, nurse assistant, and X-ray technician during 15 procedures at both frame rates. Patient-related and procedure-related variables were similar in the two groups of examinations. Mean equivalent dose absorbed (μSv) at the left side of the forehead was reduced by 61%, 60% and 36%, for the operator, nurse assistant and X-ray technician, respectively. With use of the lower frame rate similar reductions by 42%, 62% and 62% were measured at the thyroid level, and by 51%, 40% and 61% at the mid-thorax level. Cinefilming at low frame rates during coronary arteriography allows a substantial X-ray dose reduction at all body sites for all staff. Use of lower frame rates wherever possible is of special interest since it may also reduce patient radiation exposure.

DOI:10.1259/0007-1285-69-825-860

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractThe occurrence of a Crohn's abscess involving the hamstring muscle group has not been reported previously. We report this diagnosis in a patient with ileocolonic Crohn's disease who had presented earlier with a presacral abscess.

DOI:10.1259/0007-1285-69-825-865

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractJuvenile papillomatosis of the breast is a benign, localized proliferative condition encountered mainly in young women. We describe the contrast-enhanced MR imaging findings, including dynamic data, of a patient with histologically proven juvenile papillomatosis of the breast. The pre-contrastT1weighted sequence showed a hypointense lobulated mass which enhanced markedly in the post-contrast images. In the dynamic sequence the lesion showed a benign enhancement profile. The most specific feature was the presence of multiple small internal cysts, best shown on theT2weighted images. This constellation of findings should suggest juvenile papillomatosis.

DOI:10.1259/0007-1285-69-825-867

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractA characteristic appearance of highly reflective foci in the renal parenchyma has been reported in patients with pseudoxanthoma elasticum. We describe a similar patient but in addition have found two patients with a similar appearance on ultrasound who have no other evidence of the condition. The appearance of highly reflective foci in the renal parenchyma is not therefore specific for pseudoxanthoma elasticum.

DOI:10.1259/0007-1285-69-825-871

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractTwo cases of pathologically confirmed adrenal myelolipoma are described in Chinese patients. The first patient presented with tumour rupture and perinephric haemorrhage. The second patient was operated on 18 months after the incidental discovery of the tumour, due to its large size and the interval growth.

DOI:10.1259/0007-1285-69-825-873

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractThe case of a rare lymphoepithelial cyst of the pancreas is presented. The non-specific findings on endoscopic retrograde cholangiopancreaticography, endoscopic ultrasound, computed tomography and magnetic resonance imaging are discussed.

DOI:10.1259/0007-1285-69-825-876

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

AbstractMalignant teratomas of the thyroid gland are rare. These are highly malignant tumours with a high frequency of local recurrence and metastases following surgery. We report a case of malignant teratoma of the thyroid gland in a 35-year-old female, who developed local recurrence immediately following total thyroidectomy. Despite achieving local control following chemotherapy and local radiotherapy, the patient developed distant relapse illustrating the aggressive nature of the disease.

DOI:10.1259/0007-1285-69-825-879

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY

摘要:

A 39-year-old man presented with recurrent left ankle swelling. The patient had a similar mass excised from the same ankle 10 years previously but did not know the nature of the lesion. The mass recurred after 3 years, producing progressive swelling of the left ankle. The patient developed increasing left ankle pain in the 3 years prior to the current presentation. He had no other joint involvement or systemic symptoms. On examination, there was nodular swelling around the ankle joint with a consistency which varied from soft to hard on palpation.

DOI:10.1259/0007-1285-69-825-881

出版商:The British Institute of Radiology    

年代:1996

数据来源: WILEY