摘要:

There is nothing original in the title of my address—it has been used by many before over a wide range of themes. It does, however, just at this period in the history of radiology and medicine in general, seem to have some special bearing on the present and the future; although I wish to make some reference to the past also. I hope to say a few words of encouragement to those of you who may not hold one of the acknowledged plums in your speciality, whose feet may be on stony ground where the heat and burden of the day may dry up incentive; and to those who are in a much more dangerous position whose path lies in pleasant places, as mine has done, and it is so tempting to slack, but where opportunity lies at the door if you will seek it and seize hold of it—and with endeavour comes work and more work, and work so very well worth while.I suppose it is one of the privileges of advancing years to be permitted to reminisce to some extent—and I believe I must be quite one of the more elderly persons to be elected your president—and, therefore, you must forgive me if I avail myself of this privilege to some extent.

DOI:10.1259/0007-1285-24-278-57

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

Colonel Swyer died suddenly at Queen Alexandra Military Hospital on September 21, 1950. At the time of his death he was officer in charge of the Army X-ray School and Advisor in Radiology to the Army. Colonel Swyer took up radiology as his specialty after the senior course at the Royal Army Medical College in 1937, and went on to take the D.M.R. England in that year.

DOI:10.1259/0007-1285-24-278-66

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

It is, I need not emphasise, a privilege for me to address the British Institute of Radiology, and a distinct honour to deliver the Silvanus Thompson Memorial Lecture. I speak in honour of Silvanus P. Thompson to-night with cherished memories—memories that go back to my boyhood. For when I was a boy of about 12 years of age, I attempted, without much success, to rig up a telegraph line about a mile long. The capacity of the batteries and the small size of the wire used in that project, however, provided no detectable current. So my father taught me Ohm's law and handed me a book from his library; it wasDynamo Electric Machinery, by Silvanus Thompson, and it remained for many years my bible.It is also, I might add, a pleasure to be introduced by your President, Dr. Gray, not only because there are ties of friendship here, or because he has made notable contributions to radiological physics, but because he is a mere physicist. It is no accident that England excels in its radiological physics and that it has attained a position of leadership in radiation dosimetry. These were insured when the British Institute of Radiology made Engineer Silvanus P. Thompson its first President.

DOI:10.1259/0007-1285-24-278-67

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

The Physical Society's 35th Annual Exhibition of Scientific Instruments and Apparatus will be held from Friday, April 6, to Wednesday, April 11, 1951, excluding Sunday.

DOI:10.1259/0007-1285-24-278-81

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

The effects of radiation on the broad bean,Vicia faba, had been studied over a period of years at the Mount Vernon Hospital by the late Dr. J. C. Mottram, and by Dr. Read and Dr. Gray, prior to the investigation which we are about to describe.In a series of papers dating from 1913, Dr. Mottram described the effects of γ rays, β rays, and X rays on the growing tip of the broad bean root,Vicia faba. These papers record a number of interesting observations regarding the extent to which the injury produced by radiation may be influenced by changes in the physiological condition of the cells at the time of irradiation. Thus, by taking advantage of the diurnal mitotic rhythm in roots grown in the light, Mottram showed (1913) that cells at or near division are much more sensitive to radiation than are resting cells. Mottram also showed (1933) that roots irradiated when at 0 deg. C. are markedly more sensitive than those irradiated at 24 deg. C., while roots irradiated anærobically in an atmosphere of nitrogen are markedly less sensitive. Roots immersed in 1/2000 molar hydrocyanic acid for three hours were found to be more sensitive, but five-hour immersion in 1/40 molar solution of urethane was found to be without effect (Mottram, 1935). Interesting as they were, many of these experiments could only be regarded as exploratory and did not lead to any definite conclusion as to the nature of the primary radiation damage.

DOI:10.1259/0007-1285-24-278-82

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

The history of salpingography is briefly surveyed up to the present day.The alleged dangers of Lipiodol salpingography are considered and the majority of them are dismissed as being of little practical importance.The dangers of spreading tubal infection, and producing permanent tubal block from inspissation are regarded as significant. The use of water soluble media obviates the latter complication, and in this respect and some others the claims made in respect of such media are considered to have been substantiated.The advantages of salpingography from a diagnostic point of view are discussed, and the different appearances due to the use of water soluble media are described.The effects of retroversion in producing cervical block are demonstrated, and the value of the lateral view as well as serial radiography and screen control is discussed.

DOI:10.1259/0007-1285-24-278-93

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

Two cases of separation of a fragment of bone from the posterior part of the latero-inferior margin of a cervical vertebra (in the region of the unco-vertebral half joints), associated with a localised disc lesion of the disc below the separation, have been demonstrated and described.The separation of the fragment of bone is believed to be due to aseptic necrosis possibly following traumatic vascular occlusion of the arteries supplying this particular part of the vertebra. The separation, having occurred in a region where there is no synovial joint, yet showing striking similarity with the appearance of osteochondritis dissecans of synovial joints, is thought to represent a new feature in the large group of aseptic necrosing lesions of bone.

DOI:10.1259/0007-1285-24-278-103

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

The next annual meeting of the American Radium Society will be held at the Hotel Claridge, Atlantic City, N.J., on June 7, 8, and 9, 1951.

DOI:10.1259/0007-1285-24-278-106-b

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

Bones may be the site of neoplastic or inflammatory processes which may either involve the marrow spaces only, or may destroy actual bony trabeculæ. New bone formation is not being considered in this communication.When the process merely substitutes inflammatory or neoplastic cells for marrow cells, no changes demonstrable by radiographic methods are to be expected. This accounts for the presence of secondary deposits seen at post-mortem, in which no change can be seen radiographically even when slices of bone are X rayed. This point has been well demonstrated by Shackman and Harrison (1948). If bone is destroyed, however, it does not seem to be generally realised how large an amount may be destroyed in certain situations without being radiographically detectable. The following experiments were designed to give information on this point.Two normal vertebræ were removed from the lumbar region, post mortem, and radiographed with all the usual aids to produce good definition. A hole 3 mm. (⅛ in.) in diameter was drilled vertically through the centre of the vertebral bodies. The vertebræ were then radiographed in the anteroposterior and lateral projections (Fig. 1a). The air containing hole is well seen in the lateral projection, but is not visible in the antero-posterior projection where it is obscured by the spinus process. The hole was then filled with water (as an approximation to soft tissue) and plugged at each end with plasticine to prevent the water running out.

DOI:10.1259/0007-1285-24-278-107

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY

摘要:

Since other Centres are now equipped with the 2 MeV machine described in the above paper, it is fair to point out an error in the value given for the dose-rate.

DOI:10.1259/0007-1285-24-278-109-a

出版商:The British Institute of Radiology    

年代:1951

数据来源: WILEY