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R E Veen

Publications and source records attributed to R E Veen.

6 recordsLinked to original sources

Evaluation of brachytherapy implants using the "natural" volume-dose histogram.

The "natural" volume-dose histogram as described by Anderson visualises graphically even small differences between source arrangements, making it a useful tool to compare planned and realised source configurations. In this study the histogram is applied to demonstrate that the introduction of an applicator in oral cavity implants or of iridium wire spacers used as templates in bladder implants improved the quality of the implants considerably, resulting in close agreement between the planned and the realised source configuration.

Brachytherapy↗

Comparison between predicted and actual dose distribution in interstitial therapy of the oral cavity.

During the period 1985-1986, 10 patients with lesions of the floor of the mouth or of the mobile part of the tongue were treated by interstitial curietherapie with iridium-192. In the patients treated with the looping technique essential differences were found between the predicted source configuration and that actually achieved, resulting in a disagreement between precalculated and actual dose distribution. To avoid this undesirable situation, a simple oral cavity applicator was constructed which guarantees parallelism and equidistance between the implanted needles. It was found that the use of this applicator resulted in an almost complete agreement between forecast and actual dose distribution.

Brachytherapy↗

Dose determination in bladder and rectum during intracavitary irradiation of cervix carcinoma.

The radiation dosage in the base of the bladder and in the anterior wall of the rectum during intracavitary irradiation of cervix carcinoma can be determined easily by use of intracavitary transvesical and transrectal ultrasound and simultaneous radiography. In case of excessive doses to the organs at risk, the dose can be lowered by rearrangement of the vaginal gauze packing in the same sitting.

Brachytherapy↗

[Brachytherapy for urinary bladder cancer].

OBJECTIVE: To present the results achieved by brachytherapy in the treatment of bladder cancer and to review the literature on this subject. METHODS: 120 patients with bladder cancer were treated with brachytherapy at two Dutch Centres. Selection criteria were good general condition allowing anesthesia, good bladder function (capacity of 300 ml), solitary tumor maximum 5 cm diameter, T1G3, T2, T3a. Before the implant an extensive transurethral resection was performed. The urologist carried out a cystostomy and the radiation oncologist did the implant using iridium-192 wires. The administered tumor dose was 60 Gy at a dose rate of 60-90 cGy/hour. RESULTS: The 5-year overall survival and disease-free survival was 67% and 73%, respectively. By stage, the 5-year disease-free survival was 100% in T1, 80% in T2 and 67% in T3. Local failure was observed in 15 patients (13%). Six of these relapses were salvaged by cystectomy. Ten patients had a superficial tumor Ta-T1 in bladder sites other than the original tumor site. Acute and late complications were unusual. The results compare quite well with those of other series published in the literature. CONCLUSION: Brachytherapy achieves excellent results in selected patients with solitary bladder cancer maintaining a fully functional bladder. Acute and late complications of this treatment modality are relatively infrequent.

Adult↗