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At least 19 recordsLinked to original sources
PubMed1997

The usefulness of gastric mass screening using serum pepsinogen levels compared with photofluorography.

Chronic atrophic gastritis, which is though to be a high risk for gastric cancer, can be diagnosed by serum pepsinogen levels. We compared the usefulness of the measurement of pepsinogen levels and indirect photofluorography as indicators of gastric cancer in a mass screening involving 5,620 Japanese subjects (mean age: 60.1 years old; male : female = 2,268:3,352) in 1991 and 1992. Subjects with a serum pepsinogen I level below 30 micrograms/liter or a pepsinogen I/II ratio below 2.0 were considered to be at high risk of gastric cancer. The incidence of gastric cancer and the ratio of early cancers detected by pepsinogen levels (0.12%, 4/7) were similar to those detected by photofluorography (0.11%, 4/6). Our results showed that mass screening using pepsinogen levels was as useful as indirect photofluorography for the detection of gastric cancer in Japan. In addition, our results showed that the sensitivity of gastric mass screening was increased when the measurement of serum pepsinogen levels was combined with photofluorography.

Female↗
PubMed1975

105 mm photofluorography: an adjunct to the study of coronary arterial and vascular disease.

Obtaining high resolution static films through an image intensifier has been made possible by recent developments in radiographic equipment. Serial photofluorography 105 mm spot filming has been used successfully to complement cine coronary arteriography in approximately 700 patients. Many patients with coronary heart disease have diffuse peripheral atheromatous changes which are also suitable to study by serial 105 mm photofluorography. Aortic arch, abdominal aortography, and peripheral studies are easily and quickly performed in conjunction with coronary arteriography. Satisfactory results still depend upon skillful application by the angiographer of this imaging mode and proper processing of the film. Advantages of photofluorographic filming over conventional large film techniques include lower radiation exposure, reduction of costs, and easier film handling and storage. Most important is the facilitation of the performance of angiographic studies since constant television monitoring of the catheter and the contrast injections is possible. Disadvantages include restricted area of coverage and slight decrease in resolution. Our experience indicates that photofluorography may be relied upon in the study of vascular disease eliminating the need for large film changers in a laboratory used primarily for cardiac diagnosis.

Adult↗
PubMed1997

Does 100 mm photofluorography always have a dose advantage over conventional film-screen radiography in barium meals?

It is generally held that 100 mm photofluorography has a significant dose saving advantage over conventional radiography. The dose area product (DAP) data for the two formats were available for study in consecutive patients undergoing barium meal examination. There was no significant difference in DAP readings between the two formats. Conventional radiographs expose a 40% greater area than the 100 mm format, probably accounting for the lower mean DAP value of photofluorography. The mean DAP for whole examinations was 26.1 Gy cm2 for photofluorography, and 30.5 Gy cm2 for conventional radiography. These are both above the third quartile of national reference dose levels. There is little apparent difference in the doses incurred by patients between the two formats in respect of the working practice of the department. Barium meals will therefore continue to be recorded on both formats.

Barium Sulfate↗
PubMed1988

Image-intensifier photofluorography and conventional chest radiography: comparison of diagnostic efficacy.

Photofluorography with a large image intensifier, which provides an image field of 40 x 40 cm, reduces both the radiation dose and the imaging costs in chest radiography as compared with the film-screen technique. The two techniques were evaluated in a clinical study of 135 patients with suspected chest abnormalities. Photofluorographs and film-screen chest radiographs were interpreted independently by three radiologists. The diagnoses were confirmed by CT, follow-up radiographs, and clinical records. Among the 135 patients, 75 had primary lung cancer, 39 had pulmonary nodules, 52 had hilar or mediastinal abnormalities, 17 had pleural fluid, and 45 had pneumonic or atelectatic changes. Twenty-three normal subjects were included. Differences in diagnostic accuracy, measured by sensitivity and specificity, were not statistically significant. A larger number of true-positive cases (65%) with peripheral lung nodules were found by photofluorography than by film-screen radiography (54%) (p less than .05). The results suggest that the diagnostic accuracy of chest images made by photofluorography is sufficient to warrant using it instead of the film-screen technique in routine chest radiography, especially to detect lung tumors and metastases.

Humans↗
PubMed1991

Evaluation of heart size and pulmonary vasculature. Conventional chest roentgenography and image intensifier photofluorography compared.

Inter- and intraobserver variation and diagnostic accuracy in estimation of heart size and pulmonary vasculature were evaluated for conventional film-screen technique and image intensifier photofluorography. Interpretation of 218 p.a. and lateral chest films by both imaging techniques was performed independently by 4 readers. Heart size relative to body surface area measured from the plain chest films was used as the reference in cardiac size determination. Overall diagnostic accuracies of conventional radiography and image intensifier photofluorography for cardiomegaly were close to each other, 0.70 vs 0.68, respectively. Specificity of film-screen radiography was better than that of photofluorography (0.92 vs 0.84, p less than 0.05). Interobserver agreement was poor both in assessment of the heart size and pulmonary vasculature (range of kappa coefficients 0.18-0.59) while the intraobserver consistency (kappa coefficients 0.60-0.85) was good to excellent. The results suggest a limited usefulness of visual assessment of heart size and pulmonary vasculature in chest roentgenographs.

Aged↗
PubMed1988

Reduction of radiation dose and imaging costs in scoliosis radiography. Application of large-screen image intensifier photofluorography.

Photofluorography using a large-field image intensifier (Siemens Optilux 57) was applied to scoliosis radiography and compared with a full-size rare-earth screen/film technique. When scoliosis radiography (PA-projection) was performed on 25 adolescent patients, the photofluorographs were found to be of comparable diagnostic quality with full-size films. A close correspondence between the imaging techniques was found in the Cobb angle measurements as well as in the grading of rotation with the pedicle method. The use of photofluorography results in a radiation dose reduction of about one-half and considerable savings in direct imaging costs and archive space. In our opinion the method is particularly well-suited for follow-up and screening evaluation of scoliosis, but in tall patients the image field size of 40 x 40 cm restricts its usefulness as initial examination.

Adolescent↗
PubMed1981

Comparison of image intensifier photofluorography and full-size radiography in abdominal angiography.

Physical properties of photofluorography using an image intensifier tube with an input field of 30, 23 or 17 cm and 100 mm film were analysed and compared with full-size film in abdominal angiography. Factors influencing the image quality are discussed. The quality of the 100 mm films comes rather close to that of full-size films. When 17 and 23 cm input fields are sufficient, image intensifier photofluorography may replace full-size radiography. The 30 cm input field may be used in examinations of large vessels, to shorten exposure times in obese patients and in some special projections.

Angiography↗
PubMed1990

[Modern photofluorography in the diagnosis of colon cancer].

A basic improvement of the diagnostics of colorectal carcinoma (KK) in risk groups requires a complex program for a standardized fluorography of the colon and indication related endoscopy in ambulant treatment. For this we devised principles for the use of colon photofluorography as a screening method for the detection of colorectal carcinoma. In respect of organization this means the selection of risk groups and the use of new elements in colon photofluorography "prescopic period", that is carried out without radiation and automatic remote controlled air application into the rectum. We investigated 3120 patients in 96 cases and found one KK and 91 benign tumours. Our experiments show, that with this program the diagnostics of tumours can be significantly improved.

Colonic Neoplasms↗
PubMedDate not supplied

Large-image intensifier photofluorography and conventional radiography in pulmonary emphysema. Correlation with computed tomography.

Large-screen image intensifier (II) photofluorography was compared with full-size screen-film chest radiography in the diagnosis of pulmonary emphysema in 84 patients. Photospot films and conventional radiographs were interpreted independently by three radiologists. Computed tomography (CT) was used as an independent reference technique, and diagnostic performance of chest radiography in various CT patterns of emphysema was evaluated. The difference in diagnostic sensitivity for emphysema in favor of conventional chest radiography over photofluorography (0.65 versus 0.56) was statistically significant (p less than 0.05). Specificity of the imaging modalities was equal: 0.78 in full-size films and 0.77 in photospot films. All CT patterns of emphysema had great false negative response rates in chest radiography, which is an inaccurate technique for the diagnosis of emphysema. CT is required for reliable radiologic evaluation of emphysema.

Emphysema↗
PubMed1986

[Mass photofluorography in early detection of peripheral lung cancer].

During 5 consecutive years of 100 mm photofluorography, 21 cases of primary lung cancer were discovered among 211,881 checked subjects in 54 factories in the suburbs of Beijing. Detection rate was 9.9/100,000. In the male smokers 40 years old or over, who comprised 13.7% of all examined with a detection rate of 55.0/100,000. Among the 21 cases, peripheral cancer was 61.9%, in which 38.4% were stage I 69.2% were treated by surgical resection, much higher than that of the central type. It may be concluded that photofluorography in mass screening has a certain value in early detection of the peripheral lung cancer and the male smokers 40 years or over should be examined as a priority group.

Adult↗
PubMed1999

A novel panoramic machine for photofluorography.

OBJECTIVE: To describe the main features of a prototype panoramic X-ray machine modified for photofluorography. METHODS: The prototype PTM 2001 (Asahi Roentgen, Kyoto, Japan) consists of a conventional panoramic machine with a modified X-ray generator and incorporating a 9-inch image intensifier and a photofluorographic camera. RESULTS: The photofluorographic panoramic radiograph is reduced in size by 60% compared with conventional images. Using 10 cm x 45.7 m photoradiographic film 250 panoramic images can be continuously obtained. Examination time is shorter since cassette changes are not necessary. The radiation dose-in-air, measured in front of the secondary collimator, is 174 muGy. CONCLUSIONS: The advantages of the photofluorographic panoramic radiography include cost economy, shorter examination time and lower radiation exposure.

Equipment Design↗
PubMed1984

[Reduction of the radiation exposure in photofluorography by using rare earth-based fluorescent screens].

The use of highly sensitive fluorescent screens based on gadolinium in photofluorography results in considerable reduction of radiation exposure compared with conventional screens. The exposure to radiation can be reduced to a value which is hardly higher than that of a large format image. The image quality is enhanced by the incorporation of new screens because of shorter exposure times. Gadolinium foils with high image amplification are already available on a commercial basis. Exchanging them in photofluorograph equipment presents no problem.

Fluoroscopy↗
PubMed1981

Film quality in image intensifier photofluorography.

Three films of different sensitivity and grain size were tested in 70 mm image intensifier photofluorography. The radiographic exposure was kept constant, adaptation to the different film speeds being achieved by different settings of the camera diaphragm. Reduced film speed implied a greater number of object details being recorded.

Fluoroscopy↗
PubMedDate not supplied

Large-screen image intensifier photofluorography compared with full-size screen-film technique in chest radiography.

Large-screen image intensifier photofluorography revealed a radiation dose and exposure time of about one third of those of a medium speed rare-earth screen/film (Trimax T4/XD) combination for full-size chest radiography. The resolving power of the former technique is somewhat poorer and there is a moderate electron-òptical distortion in the peripheral field. In clinical chest radiography photospot films showed excellent demonstration of the central areas of the image but slight deterioration in peripheral parts. The minification effect of the photofluorographic films is advantageous for visual perception of many anatomic details on chest radiographs. The type of viewing device for photospot films is important.

Aged↗
PubMed1975

[Proceedings: 70 mm photofluorography: a valuable aid in coronary angiographic studies].

With the development of new intensifiers using cesium iodide as the input phosphor and having a spatial frequency of up to 4 lines/mm, it has become possible to obtain high contrast serial photographs using a 70 mm camera. In 48 patients undergoing coronary arteriography, 35 mm cine and 70 mm spotfilms were obtained at exposures as follows: 3 msec, 75-95 kV at 200 mA for the 35 mm cine (50 frames/sec) and 6-10 msec, 75-95 kV at 300 mA (4 FRAMES/SEc) for the 70 mm images. Image quality and diagnostic information of the two media were compared. 70 mm films were of excellent quality. The vessel edges showed up sharp, the pictures were high in contrast, and small arteries in particular could be well defined. 70 mm photofluorography offers many advantages which are discussed.

Cardiomegaly↗
PubMed1975

Serial coronary arteriography with 105mm photofluorography: 24-month experience, 2,200 patients.

A 105 mm camera has been used for over 24 mo in evaluation of the coronary circulation for the most part and occasionally the proximal peripheral arteries in 2,200 patients. This photofluorographic technique provides sufficient diagnostic image detail with improved operating convenience and reduced radiation exposure compared to the large film changer. 105 mm serialography is a good adjunct to cine arteriography as a complementary film recording system, and in many cases may supplement large film serialography.

Angiography↗
PubMed1977

Method for comparing films and processing procedures in photofluorography.

A method for comparing measurements of films and processing procedures is described. A stepped wedge is developed on basis of density measurements in defined areas of chest photofluorographic films. Quality criteria for films and processing procedures are established by systemization of film evaluation. Minor modifications of the method are necessary for application elsewhere in diagnostic radiology.

Fluoroscopy↗
PubMedDate not supplied

Ovarian radiation dose during dynamic cystourethrography using videorecording and photofluorography.

The ovarian radiation dose in dynamic cystourethrography was estimated by thermoluminescence dosimetry in a phantom and in 26 patients. The urodynamic examination technique was standardized and included fluoroscopy with videorecording and rapid sequence 100 mm fluorography. The examination was performed in the lateral position with dosimeters in the vagina, uterine cavity and rectum. The total dose in the midline was 13 mGy per examination, which compares with 12 mGy in urography.

Adult↗