Biomedical subjects

A W Huiskes

Publications and source records attributed to A W Huiskes.

5 recordsLinked to original sources

PubMed1999

Can bone marrow scintigraphy predict platelet toxicity after treatment with 186Re-HEDP?

The toxicity of 186Re-1,1-hydroxyethylidene diphosphonate (186Re-HEDP) therapy in patients with painful bone metastases is mainly limited to thrombocytopaenia. The aim of this study was to investigate the influence of bone marrow scintigraphy on the prediction of decreased platelet counts after 186Re-HEDP therapy. Twenty-nine prostatic cancer patients with multiple painful bone metastases were included in the study. From a pre-therapy nanocolloid bone marrow scintigram, the bone marrow index (BMI) was determined as an indicator of the extent of bone marrow involvement. The influence of the BMI on the prediction of percent decrease in platelet counts was investigated. The mean BMI was 59 +/- 20. Regression analysis showed that the BMI does not improve the relationship between percent reduction in platelet count and administered dose. In contrast, we previously showed that the bone scan index (BSI) does predict the percent reduction in platelet counts before treatment. We conclude that bone marrow scintigraphy does not provide any additional information on platelet toxicity after a therapeutic dose of 186Re-HEDP. Bone scintigraphy is preferred in the prediction of reduced platelet counts.

Aged↗

PubMed1999

Integrated visualization of functional and anatomic brain data: a validation study.

UNLABELLED: Two-dimensional SPECT display and three methods for integrated visualization of SPECT and MRI patient data are evaluated in a multiobserver study to determine whether localization of functional data can be improved by adding anatomical information to the display. METHODS: SPECT and MRI data of 30 patients were gathered and presented using four types of display: one of SPECT in isolation, two integrated two-dimensional displays and one integrated three-dimensional display. Cold and hot spots in the peripheral cortex were preselected and indicated on black-and-white hard copies of the image data. Nuclear medicine physicians were asked to assign the corresponding spots in the image data on the computer screen to a lobe and a gyrus and give a confidence rating for both localizations. Interobserver agreement using kappa statistics and average confidence ratings were assessed to interpret the reported observations. RESULTS: Both the interobserver agreement and the confidence of the observers were greater for the integrated two-dimensional displays than for the two-dimensional SPECT display. An additional increase in agreement and confidence was seen with the integrated three-dimensional display. CONCLUSION: Integrated display of SPECT and MR brain images provides better localization of cerebral blood perfusion abnormalities in the peripheral cortex in relation to the anatomy of the brain than single-modality display and increases the confidence of the observer.

Cerebral Cortex↗

PubMed1998

[Palliative treatment of bone metastases with bone-seeking radionuclides].

The skeleton is a common site for metastases in patients with prostate and breast cancer. Beside analgesic therapy and external beam radiotherapy, the use of bone-seeking radiopharmaceuticals gives pain relief. Analogues of these pharmaceuticals are also applied in skeletal scintigraphy. They accumulate at the site of high osteoblast activity and in this way they exert a local favourable influence on metastases through their radiation (beta particles or conversion electrons). The bone-seeking radiopharmaceuticals include strontium-89 chloride and rhenium-186 hydroxyethylidenediphosphonate. The main adverse reaction that has been observed is myelosuppression.

Bone Marrow↗

PubMed1998

Reverse discordant scintigraphy in diffuse goiter.

Both Tc-99m pertechnetate and radioactive iodine (I-123 NaI or I-131 NaI) are useful in thyroid scintigraphy. These radiopharmaceuticals yield similar functional information in most patients. Occasionally, however, discordant results have been reported in the literature (warm or hot on the pertechnetate image and cold on the radioiodide image). Most of these reports have concerned the solitary thyroid nodule. A case is presented here with diffusely decreased Tc-99m pertechnetate uptake and normal I-131 NaI uptake in a patient with a diffuse goiter and subclinical hyperthyroidism, so-called reverse discordant behavior.

Goiter↗

PubMed1991

[Diabetic retinopathy: agreement of fundoscopic assessment by the family physician and the ophthalmologist].

The quality of retinoscopy in 70 patients with diabetes mellitus performed by 7 general practitioners and one ophthalmologist was compared with a color picture of the central retina. The mean kappa index of the general practitioners was 0.21 (-0.11-0.73). This implies that the skills of general practitioners are currently inadequate to take care of the screening for diabetic retinopathy. The ophthalmologist scored insufficiently by examining without dilating the pupil.

Diabetic Retinopathy↗